SPINAL CORD and Ascending Tracts

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SPINAL CORD (Ascending Tracts):

SPINAL CORD (Ascending Tracts) Professor Husan Bano Department of Physiology Al- Tibri Medical College& Hospital ISRA University

Introduction To Spinal Cord:

Introduction To Spinal Cord Spinal cord developed on segmental bases . It consists of 31 segments. It is elongated and cylindrical part of CNS .

Introduction To Spinal Cord:

Introduction To Spinal Cord It is situated in vertebral canal of vertebral column. It is surrounded by meninges and CSF .

Introduction To Spinal Cord:

Introduction To Spinal Cord It is started from medulla and extends to the lower border of 1 st . Lumber vertebrae. When specimen of CSF is required for diagnostic purpose, it is taken from below the end of the cord. ( below the level of L2 ) This is called “Lumber Puncture”

Introduction To Spinal Cord:

Introduction To Spinal Cord It is situated in vertebral canal of vertebral column. It is surrounded by meninges and CSF .

Introduction To Spinal Cord:

Introduction To Spinal Cord Spinal cord is as thin as , the thickness of pencil or it is as thick as the thickness of little finger

Cross-section of Spinal Cord:

Cross-section of Spinal Cord Cross-section of spinal cord shows that it is divided into two lateral halves. Throughout the length of spinal cord, the central canal is situated through which the CSF is circulated.

Cross-section of Spinal Cord:

Cross-section of Spinal Cord Cross-section of spinal cord shows that it is divided into two lateral halves. Throughout the length of spinal cord, the central canal is situated through which the CSF is circulated.

Grey Matter:

Grey Matter Grey matter divided into two horns. Anterior horn Posterior horn Anterior horn is broad and anterior nerve root is arises from this part. Posterior horn is narrow and posterior nerve roots are arises from this part.

Grey Matter:

Grey Matter Posterior nerve root is sensory in nature. They receive the impulses from receptors and gives the impulses to anterior horn cell. Anterior nerve root is motor in nature. They transmit the impulses to the effecter organs such as muscle .

White matter:

White matter White matter present around the grey matter. It consists of myleinated and non myelinated neurons. White matter consists of 3 columns. Lateral white column. Posterior white column Anterior white column Lateral white Column

White matter:

White matter Each of these column, different nerve tract arises. These tracts are of two types. Ascending tract . ( Afferent) Descending tract .(Efferent)

Ascending Tracts:

Ascending Tracts Ascending tract are sensory in nature. They are present in anterior, posterior and lateral white column. They carries the impulses from spinal cord to brain.

Ascending Tracts of Posterior White Column:

Ascending Tracts of Posterior White Column 1. Fasciculus Gracilis This tract carries the impulses from the lower half of the body . They carrying the sensation of fine touch, tectile discrimination (J udgment), Kinasthetic sensation sense of vibration. C G G C

Ascending Tracts of Posterior White Column:

Ascending Tracts of Posterior White Column 2. Fasiculus Cuneatus : This tract carries the impulses from upper half of body. They carrying same sensory impulses as it is carried by fasciculus Gracilis .

Ascending Tracts of Lateral White Column (9 Tracts):

Ascending Tracts of Lateral White Column (9 Tracts) Dorsal- spino -thalamic tract: It receive the impulses from skin receptors and gives these impulses to thalamus ,and to cerebral cortex. Functions: It carries the impulses of pain and temperature (both heat and cold) .

Ascending Tracts of Lateral White Column:

Ascending Tracts of Lateral White Column 2. Spino - tectal tract: It receive the impulses from eye and send their impulses in occipital lobe . Functions: It sub serves the visual reflex.

Ascending Tracts of Lateral White Column:

Ascending Tracts of Lateral White Column Dorsal spino cerebellar tract: It receive the impulses from muscle and sends to the cerebellum. Functions: It carries unconscious Kinesthetic sensation to the cerebellum and maintained the posture and muscle tone.

Ascending Tracts of Lateral White Column:

Ascending Tracts of Lateral White Column 4. Ventral -Spino - Cerebellar tract: It receive the impulses from muscle and sends to the cerebellum . It is arises from ventral aspect of spinal cord. Functions: Both dorsal and ventral Spino-cerebellar tract are important for the maintenance of tone , posture , and equilibrium

Ascending Tracts of Lateral White Column:

Ascending Tracts of Lateral White Column 5. Spino-Olivery tract: This tract transmit proprioceptive impulses to the cerebellum via inferior olivery nucleus. Proprioceptors are the stretch receptors present in muscle, tendon and other tissues of body. Functions: It give the information about movement and posture of body.

Ascending Tracts of Lateral White Column:

Ascending Tracts of Lateral White Column Spino reticular tract: This tract play an important role in the maintenance of consciousness and awareness. Spino vestibular tract This tract concerned “Postural reflexes” Spino-pontine tract This tract concerned with exterioreceptors

Ascending Tracts of Lateral White Column:

Ascending Tracts of Lateral White Column 7. Spino cortical tract: The function of this tract is not clear. It is arises from all the parts of spinal cord

Ascending Tracts of Anterior White Column (Only one tract):

Ascending Tracts of Anterior White Column (Only one tract) Ventral -spino - thalamic tract: this treat carrying impulses of fine touch.

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