Questions Flashcards
(81 cards)
- What is the anatomical/histological substrate of the enlargements of the spinal
cord?
spinal cord is enlarged in 2 regions for the innervation of the muscles of the limbs:
-The cervical enlargement: includes segments C5 to T1 spinal cord segment and gives rise to the brachial plexus. (contains neuronal soma for the innervation of the upper extremities)
-The lumbosacral enlargement: includes segments L1 to S3 spinal cord segment, and gives rise to the lumbosacral plexus. (contains neuronal soma for the innervation of the lower extremities)
- At which vertebral level is the medullary cone located in adults?
L1 (Sometimes L2)
- What sort of nerve fibers travel in the anterior root?
MOTOR fibers: somatomotor and visceromotor fibers
- What sort of nerve fibers travel in the posterior root?
SENSORY fibers: somatosensory and viscerosensory fibers
- Which cisterns are used for CSF withdrawal?
Cisterna magna or cerebellomedullary cistern, lumbar cistern.
- What are the names of (both potential and real) spaces between the layers of
the spinal meninges?
Epidural Space - real
Subdural Space - real
Subarachnoid Space - real
- Which pathways travel in the anterior funiculus?
Ascending - Ant. Spinothalamic tract and spinoreticular tract
Descending - Ant. Corticospinal tract, tectosoinal tract and olivospinal tract
- Which pathways travel in the lateral funiculus?
Ascending - lat. spinothalamic tract, dorsal spinocerebellar tract, spinoolivary tract and spinotectal tract.
Descending - lat. corticoscopal tract and Rubrospinal tract.
- Which pathways travel in the posterior funiculus?
- Fasciculus gracilis
- Fasciculus cuneatus
- Fasciculus septomarginalis
- What are Rexed laminae (spinal laminae of Rexed)?
Rexed’s laminae is an cytoarchitectural classification of the structure of the gray matter of the spinal cord, based on the cytological features of the neurons in different regions of the gray substance.
- How many Rexed laminae are found in the gray matter of spinal cord?
10
- Where does the 1st cervical nerve exit from the vertebral column?
Between the atlas and occipital bone.
- Where does the 8th cervical nerve exit from the vertebral column?
Between the vertebrae C7 and T1.
- What make up the cauda equina?
Axons of nerves on levels L1-L5 that give motor and sensory innervation to the legs, bladder, anus and perineum.
Bundle of spinal nerves and spinal nerve rootlets, consisting of 2nd-5th lumbar nerve pairs,1st-5th sacral nerve pairs, and the coccygeal nerve, all of which arise from the lumbar enlargement and the filum terminale of the spinal cord.
- Which cranial nerves exit from the retro-olivary groove?
Glossopharyngeal 9th (CN. IX) and Vagus10th (CN. X) and Accessory Nerve 11th (CN. XI)
- Which cranial nerve exits from the pre-olivary groove?
Hypoglossal n. (CN. XII)
- Which cranial nerves exit from the pontocerebellar angle?
Vestibulocochlear n. (CN. VIII.) and facial n. (CN. VII.)
- Where does the oculomotor nerve exit from the brainstem?
Through the interpeduncular fossa
- Where does the trochlear nerve exit from the brainstem?
On the dorsal side of the midbrain, at the level of the inferior colliculus.
- Where does the trigeminal nerve exit from the brainstem?
Rostral anterior surface of pons
At the junction between pons and middle cerebellar peduncle.
- Where does the abducent nerve exit from the brainstem?
At the junction of the pons and pyramid/ pontomedullary junction or bulbopontine sulcus
- Where does the hypoglossal nerve exit from the brainstem?
Pre-olivary groove.
- What is the name of the floor of 4th ventricle?
Rhomboid fossa
- What are the names of the outlets of 4th ventricle?
Foramen of Magendie (1), Foramina of Luschka (2)
Opening of the central canal at the level of the obex.