Primary motor cortex - Revision history

BPEASE at 15:43, 24 April 2008

BPEASE — Thu, 24 Apr 2008 15:43:29 GMT

←Older revision		Revision as of 15:43, 24 April 2008
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	[http://www.emc.maricopa.edu/faculty/farabee/BIOBK/cerebrum_1.gif Picture of Primary Motor Cortex]		[http://www.emc.maricopa.edu/faculty/farabee/BIOBK/cerebrum_1.gif Picture of Primary Motor Cortex]
	== Background ==		== Background ==
		+	• Primary motor cortex is also called M1

		+	• One of the principle areas involved in motor function
		+
		+	• Located in the frontal lobe of the brain along the precentral gyrus
		+
		+	• The role is to generate neural impulses that control the execution of movement
		+
		+	• Signals from M1 cross the body’s midline to activate skeletal muscles on the opposite side of the body
		+
		+	• The right hemisphere controls the left side of the body
		+
		+	• The left hemisphere controls the right side of the body
	== Somatotopic Representation ==		== Somatotopic Representation ==
		+	• Every part of the body is represented in the primary motor cortex

		+	• Body part representations are arranged somatotopically

-	~~== Damage~~ to ~~Primary Motor Cortex ==~~	+	• The foot is next to the leg, next to the trunk, next to the arm, which is next to the hand

		+	• The amount of brain matter devoted to a particular body part represents the amount of control that the primary motor cortex has over that body part

		+	• A lot of cortical space is devoted to complex hand and finger movements; therefore, they have larger representations in M1
		+	== Corticospinal Tract ==
		+	• Neurons in M1, supplementary motor area, and premotor cortex give rise to fibers of the corticospinal tract
		+
		+	• The corticospinal tract is the only direct pathway from the cortex to the spine
		+
		+	• This tract is composed of over a million fibers
		+
		+	• The fibers descend through the brainstem and cross to the opposite side of the body
		+
		+	• The fibers then continue to descend through the spine, terminating at the appropriate spinal levels
		+
		+	• This tract is the main pathway for control of voluntary movement in humans
		+	== Damage to Primary Motor Cortex ==
		+	• Lesions in the primary motor cortex result in paralysis of the contralateral side of the body
	== Works Cited ==		== Works Cited ==
	[http://www.brainconnection.com/topics/?main=anat/motor-anat The Anatomy of Movement]		[http://www.brainconnection.com/topics/?main=anat/motor-anat The Anatomy of Movement]

	[http://en.wikipedia.org/wiki/Primary_motor_cortex Primary Motor Cortex]		[http://en.wikipedia.org/wiki/Primary_motor_cortex Primary Motor Cortex]

BPEASE at 15:41, 24 April 2008

BPEASE — Thu, 24 Apr 2008 15:41:36 GMT

←Older revision		Revision as of 15:41, 24 April 2008
Line 3:		Line 3:
	[http://www.emc.maricopa.edu/faculty/farabee/BIOBK/cerebrum_1.gif Picture of Primary Motor Cortex]		[http://www.emc.maricopa.edu/faculty/farabee/BIOBK/cerebrum_1.gif Picture of Primary Motor Cortex]
	== Background ==		== Background ==
-	~~â�¢ Primary motor cortex is also called M1~~

-	~~â�¢ One of the principle areas involved in motor function~~
-
-	~~â�¢ Located in the frontal lobe of the brain along the precentral gyrus~~
-
-	~~â�¢ The role is to generate neural impulses that control the execution of movement~~
-
-	~~â�¢ Signals from M1 cross the bodyâ��s midline to activate skeletal muscles on the opposite side of the body~~
-
-	~~â�¢ The right hemisphere controls the left side of the body~~
-
-	~~â�¢ The left hemisphere controls the right side of the body~~
	== Somatotopic Representation ==		== Somatotopic Representation ==
-	~~â�¢ Every part of the body is represented in the primary motor cortex~~

-	~~â�¢ Body part representations are arranged somatotopically~~

-	~~â�¢ The foot is next~~ to ~~the leg, next to the trunk, next to the arm, which is next to the hand~~	+	== Damage to Primary Motor Cortex ==

-	~~â�¢ The amount of brain matter devoted to a particular body part represents the amount of control that the primary motor cortex has over that body part~~
-
-	~~â�¢ A lot of cortical space is devoted to complex hand and finger movements; therefore, they have larger representations in M1~~
-	~~== Corticospinal Tract ==~~
-	~~â�¢ Neurons in M1, supplementary motor area, and premotor cortex give rise to fibers of the corticospinal tract~~
-
-	~~â�¢ The corticospinal tract is the only direct pathway from the cortex to the spine~~
-
-	~~â�¢ This tract is composed of over a million fibers~~
-
-	~~â�¢ The fibers descend through the brainstem and cross to the opposite side of the body~~
-
-	~~â�¢ The fibers then continue to descend through the spine, terminating at the appropriate spinal levels~~
-
-	~~â�¢ This tract is the main pathway for control of voluntary movement in humans~~
-
-	~~== Damage to Primary Motor Cortex ==~~
-	~~â�¢ Lesions in the primary motor cortex result in paralysis of the contralateral side of the body~~

	== Works Cited ==		== Works Cited ==
	[http://www.brainconnection.com/topics/?main=anat/motor-anat The Anatomy of Movement]		[http://www.brainconnection.com/topics/?main=anat/motor-anat The Anatomy of Movement]
		+
		+	[http://en.wikipedia.org/wiki/Primary_motor_cortex Primary Motor Cortex]

BPEASE at 15:40, 24 April 2008

BPEASE — Thu, 24 Apr 2008 15:40:13 GMT

BPEASE at 15:37, 24 April 2008

BPEASE — Thu, 24 Apr 2008 15:37:20 GMT

←Older revision		Revision as of 15:37, 24 April 2008
Line 40:		Line 40:

	== Damage to Primary Motor Cortex ==		== Damage to Primary Motor Cortex ==
-	~~â�¢~~ Lesions in the primary motor cortex result in paralysis of the contralateral side of the body	+	• Lesions in the primary motor cortex result in paralysis of the contralateral side of the body

BPEASE at 15:36, 24 April 2008

BPEASE — Thu, 24 Apr 2008 15:36:54 GMT

←Older revision		Revision as of 15:36, 24 April 2008
Line 27:		Line 27:
	• A lot of cortical space is devoted to complex hand and finger movements; therefore, they have larger representations in M1		• A lot of cortical space is devoted to complex hand and finger movements; therefore, they have larger representations in M1
	== Corticospinal Tract ==		== Corticospinal Tract ==
		+	• Neurons in M1, supplementary motor area, and premotor cortex give rise to fibers of the corticospinal tract

		+	• The corticospinal tract is the only direct pathway from the cortex to the spine
		+
		+	• This tract is composed of over a million fibers
		+
		+	• The fibers descend through the brainstem and cross to the opposite side of the body
		+
		+	• The fibers then continue to descend through the spine, terminating at the appropriate spinal levels
		+
		+	• This tract is the main pathway for control of voluntary movement in humans

	== Damage to Primary Motor Cortex ==		== Damage to Primary Motor Cortex ==
	â�¢ Lesions in the primary motor cortex result in paralysis of the contralateral side of the body		â�¢ Lesions in the primary motor cortex result in paralysis of the contralateral side of the body

BPEASE at 15:36, 24 April 2008

BPEASE — Thu, 24 Apr 2008 15:36:09 GMT

←Older revision		Revision as of 15:36, 24 April 2008
Line 17:		Line 17:
	• The left hemisphere controls the right side of the body		• The left hemisphere controls the right side of the body
	== Somatotopic Representation ==		== Somatotopic Representation ==
-	~~â�¢~~ Every part of the body is represented in the primary motor cortex	+	• Every part of the body is represented in the primary motor cortex

-	~~â�¢~~ Body part representations are arranged somatotopically	+	• Body part representations are arranged somatotopically

-	~~â�¢~~ The foot is next to the leg, next to the trunk, next to the arm, which is next to the hand	+	• The foot is next to the leg, next to the trunk, next to the arm, which is next to the hand

-	~~â�¢~~ The amount of brain matter devoted to a particular body part represents the amount of control that the primary motor cortex has over that body part	+	• The amount of brain matter devoted to a particular body part represents the amount of control that the primary motor cortex has over that body part

-	~~â�¢~~ A lot of cortical space is devoted to complex hand and finger movements; therefore, they have larger representations in M1	+	• A lot of cortical space is devoted to complex hand and finger movements; therefore, they have larger representations in M1
	== Corticospinal Tract ==		== Corticospinal Tract ==
-	~~â�¢ Neurons in M1, supplementary motor area, and premotor cortex give rise to fibers of the corticospinal tract~~

-	~~â�¢ The corticospinal tract is the only direct pathway from the cortex to the spine~~
-
-	~~â�¢ This tract is composed of over a million fibers~~
-
-	~~â�¢ The fibers descend through the brainstem and cross to the opposite side of the body~~
-
-	~~â�¢ The fibers then continue to descend through the spine, terminating at the appropriate spinal levels~~
-
-	~~â�¢ This tract is the main pathway for control of voluntary movement in humans~~

	== Damage to Primary Motor Cortex ==		== Damage to Primary Motor Cortex ==
	â�¢ Lesions in the primary motor cortex result in paralysis of the contralateral side of the body		â�¢ Lesions in the primary motor cortex result in paralysis of the contralateral side of the body

BPEASE at 15:34, 24 April 2008

BPEASE — Thu, 24 Apr 2008 15:34:57 GMT

←Older revision		Revision as of 15:34, 24 April 2008
Line 3:		Line 3:
	[http://www.emc.maricopa.edu/faculty/farabee/BIOBK/cerebrum_1.gif Picture of Primary Motor Cortex]		[http://www.emc.maricopa.edu/faculty/farabee/BIOBK/cerebrum_1.gif Picture of Primary Motor Cortex]
	== Background ==		== Background ==
-	~~â�¢~~ Primary motor cortex is also called M1	+	• Primary motor cortex is also called M1

-	~~â�¢~~ One of the principle areas involved in motor function	+	• One of the principle areas involved in motor function

-	~~â�¢~~ Located in the frontal lobe of the brain along the precentral gyrus	+	• Located in the frontal lobe of the brain along the precentral gyrus

-	~~â�¢~~ The role is to generate neural impulses that control the execution of movement	+	• The role is to generate neural impulses that control the execution of movement

-	~~â�¢~~ Signals from M1 cross the ~~bodyâ��s~~ midline to activate skeletal muscles on the opposite side of the body	+	• Signals from M1 cross the body’s midline to activate skeletal muscles on the opposite side of the body

-	~~â�¢~~ The right hemisphere controls the left side of the body	+	• The right hemisphere controls the left side of the body

-	~~â�¢~~ The left hemisphere controls the right side of the body	+	• The left hemisphere controls the right side of the body
	== Somatotopic Representation ==		== Somatotopic Representation ==
	â�¢ Every part of the body is represented in the primary motor cortex		â�¢ Every part of the body is represented in the primary motor cortex

BPEASE at 15:33, 24 April 2008

BPEASE — Thu, 24 Apr 2008 15:33:26 GMT

BPEASE at 15:23, 24 April 2008

BPEASE — Thu, 24 Apr 2008 15:23:46 GMT

←Older revision		Revision as of 15:23, 24 April 2008
Line 38:		Line 38:

	• This tract is the main pathway for control of voluntary movement in humans		• This tract is the main pathway for control of voluntary movement in humans
		+
		+	== Damage to Primary Motor Cortex ==
		+	• Lesions in the primary motor cortex result in paralysis of the contralateral side of the body

BPEASE at 15:23, 24 April 2008

BPEASE — Thu, 24 Apr 2008 15:23:05 GMT

←Older revision		Revision as of 15:23, 24 April 2008
Line 26:		Line 26:

	• A lot of cortical space is devoted to complex hand and finger movements; therefore, they have larger representations in M1		• A lot of cortical space is devoted to complex hand and finger movements; therefore, they have larger representations in M1
		+	== Corticospinal Tract ==
		+	• Neurons in M1, supplementary motor area, and premotor cortex give rise to fibers of the corticospinal tract
		+
		+	• The corticospinal tract is the only direct pathway from the cortex to the spine
		+
		+	• This tract is composed of over a million fibers
		+
		+	• The fibers descend through the brainstem and cross to the opposite side of the body
		+
		+	• The fibers then continue to descend through the spine, terminating at the appropriate spinal levels
		+
		+	• This tract is the main pathway for control of voluntary movement in humans

←Older revision		Revision as of 15:40, 24 April 2008
Line 3:		Line 3:
	[http://www.emc.maricopa.edu/faculty/farabee/BIOBK/cerebrum_1.gif Picture of Primary Motor Cortex]		[http://www.emc.maricopa.edu/faculty/farabee/BIOBK/cerebrum_1.gif Picture of Primary Motor Cortex]
	== Background ==		== Background ==
-	• Primary motor cortex is also called M1	+	â�¢ Primary motor cortex is also called M1

-	• One of the principle areas involved in motor function	+	â�¢ One of the principle areas involved in motor function

-	• Located in the frontal lobe of the brain along the precentral gyrus	+	â�¢ Located in the frontal lobe of the brain along the precentral gyrus

-	• The role is to generate neural impulses that control the execution of movement	+	â�¢ The role is to generate neural impulses that control the execution of movement

-	• Signals from M1 cross the ~~body’s~~ midline to activate skeletal muscles on the opposite side of the body	+	â�¢ Signals from M1 cross the bodyâ��s midline to activate skeletal muscles on the opposite side of the body

-	• The right hemisphere controls the left side of the body	+	â�¢ The right hemisphere controls the left side of the body

-	• The left hemisphere controls the right side of the body	+	â�¢ The left hemisphere controls the right side of the body
	== Somatotopic Representation ==		== Somatotopic Representation ==
-	• Every part of the body is represented in the primary motor cortex	+	â�¢ Every part of the body is represented in the primary motor cortex

-	• Body part representations are arranged somatotopically	+	â�¢ Body part representations are arranged somatotopically

-	• The foot is next to the leg, next to the trunk, next to the arm, which is next to the hand	+	â�¢ The foot is next to the leg, next to the trunk, next to the arm, which is next to the hand

-	• The amount of brain matter devoted to a particular body part represents the amount of control that the primary motor cortex has over that body part	+	â�¢ The amount of brain matter devoted to a particular body part represents the amount of control that the primary motor cortex has over that body part

-	• A lot of cortical space is devoted to complex hand and finger movements; therefore, they have larger representations in M1	+	â�¢ A lot of cortical space is devoted to complex hand and finger movements; therefore, they have larger representations in M1
	== Corticospinal Tract ==		== Corticospinal Tract ==
-	• Neurons in M1, supplementary motor area, and premotor cortex give rise to fibers of the corticospinal tract	+	â�¢ Neurons in M1, supplementary motor area, and premotor cortex give rise to fibers of the corticospinal tract

-	• The corticospinal tract is the only direct pathway from the cortex to the spine	+	â�¢ The corticospinal tract is the only direct pathway from the cortex to the spine

-	• This tract is composed of over a million fibers	+	â�¢ This tract is composed of over a million fibers

-	• The fibers descend through the brainstem and cross to the opposite side of the body	+	â�¢ The fibers descend through the brainstem and cross to the opposite side of the body

-	• The fibers then continue to descend through the spine, terminating at the appropriate spinal levels	+	â�¢ The fibers then continue to descend through the spine, terminating at the appropriate spinal levels

-	• This tract is the main pathway for control of voluntary movement in humans	+	â�¢ This tract is the main pathway for control of voluntary movement in humans

	== Damage to Primary Motor Cortex ==		== Damage to Primary Motor Cortex ==
-	• Lesions in the primary motor cortex result in paralysis of the contralateral side of the body	+	â�¢ Lesions in the primary motor cortex result in paralysis of the contralateral side of the body
		+
		+	== Works Cited ==
		+	[http://www.brainconnection.com/topics/?main=anat/motor-anat The Anatomy of Movement]

←Older revision		Revision as of 15:33, 24 April 2008
Line 1:		Line 1:
	[[Category:Brain areas]]		[[Category:Brain areas]]

-		+	[http://www.emc.maricopa.edu/faculty/farabee/BIOBK/cerebrum_1.gif Picture of Primary Motor Cortex]
	== Background ==		== Background ==
-	• Primary motor cortex is also called M1	+	â�¢ Primary motor cortex is also called M1

-	• One of the principle areas involved in motor function	+	â�¢ One of the principle areas involved in motor function

-	• Located in the frontal lobe of the brain along the precentral gyrus	+	â�¢ Located in the frontal lobe of the brain along the precentral gyrus

-	• The role is to generate neural impulses that control the execution of movement	+	â�¢ The role is to generate neural impulses that control the execution of movement

-	• Signals from M1 cross the ~~body’s~~ midline to activate skeletal muscles on the opposite side of the body	+	â�¢ Signals from M1 cross the bodyâ��s midline to activate skeletal muscles on the opposite side of the body

-	• The right hemisphere controls the left side of the body	+	â�¢ The right hemisphere controls the left side of the body

-	• The left hemisphere controls the right side of the body	+	â�¢ The left hemisphere controls the right side of the body
	== Somatotopic Representation ==		== Somatotopic Representation ==
-	• Every part of the body is represented in the primary motor cortex	+	â�¢ Every part of the body is represented in the primary motor cortex

-	• Body part representations are arranged somatotopically	+	â�¢ Body part representations are arranged somatotopically

-	• The foot is next to the leg, next to the trunk, next to the arm, which is next to the hand	+	â�¢ The foot is next to the leg, next to the trunk, next to the arm, which is next to the hand

-	• The amount of brain matter devoted to a particular body part represents the amount of control that the primary motor cortex has over that body part	+	â�¢ The amount of brain matter devoted to a particular body part represents the amount of control that the primary motor cortex has over that body part

-	• A lot of cortical space is devoted to complex hand and finger movements; therefore, they have larger representations in M1	+	â�¢ A lot of cortical space is devoted to complex hand and finger movements; therefore, they have larger representations in M1
	== Corticospinal Tract ==		== Corticospinal Tract ==
-	• Neurons in M1, supplementary motor area, and premotor cortex give rise to fibers of the corticospinal tract	+	â�¢ Neurons in M1, supplementary motor area, and premotor cortex give rise to fibers of the corticospinal tract

-	• The corticospinal tract is the only direct pathway from the cortex to the spine	+	â�¢ The corticospinal tract is the only direct pathway from the cortex to the spine

-	• This tract is composed of over a million fibers	+	â�¢ This tract is composed of over a million fibers

-	• The fibers descend through the brainstem and cross to the opposite side of the body	+	â�¢ The fibers descend through the brainstem and cross to the opposite side of the body

-	• The fibers then continue to descend through the spine, terminating at the appropriate spinal levels	+	â�¢ The fibers then continue to descend through the spine, terminating at the appropriate spinal levels

-	• This tract is the main pathway for control of voluntary movement in humans	+	â�¢ This tract is the main pathway for control of voluntary movement in humans

	== Damage to Primary Motor Cortex ==		== Damage to Primary Motor Cortex ==
-	• Lesions in the primary motor cortex result in paralysis of the contralateral side of the body	+	â�¢ Lesions in the primary motor cortex result in paralysis of the contralateral side of the body