Neuroanatomy Flashcards
Where does the spinothalamic tract decussate?
Ventral white commissure of the spinal cord at the level of the dorsal horn
What sensations are transmitted through the spinothalamic tract? (anterior and lateral)
Anterior - crude touch, pressure
Lateral - pain, temperature
Which spinal roots carry sensations through the fasciculus cuneatus and gracilis?
Cuneatus - Above T6
Gracilis - T6 and below
Which sensations are transmitted through the dorsal columns?
Vibration
Fine touch
Conscious proprioception (complex motor tasks)
Where do the dorsal columns decussate?
Medulla
What is the function of the corticospinal tract? Anterior and lateral
Anterior - postural movements
Lateral - fine movements of the distal limbs
Where does the corticospinal tract decussate? Anterior and lateral
Anterior - spinal cord
Lateral - medullary pyramids
Which corticobulbar tracts innervate the cranial nerves contralaterally rather than bilaterally?
VII, XII
What is the dermatome of the male breast?
T4
What is the dermatome of the umbilicus?
T10
What is the dermatome of the groin?
L1

What is the dermatome of the big toe?
L4
What is the dermatome of the sole of the foot?
L5
What is the dermatome of the middle finger?
C7
What are the four medial structures in the brainstem?
- Motor pathway (corticospinal tract)
- Medial leminiscus (vibration and proprioception)
- Medial longitudinal fasciculus (ipsilateral internuclear opthalmoplegia)
- Motor nucleus and nerve (3, 4, 6, 12)
What are the four lateral (side) structures in the brainstem?
- Spinocerebellar pathways (ataxia)
- Spinothalamic pathway (pain and temperature)
- Sensory nucleus of the 5th cranial nerve
- Sympathetic
What structures are passed through when giving spinal anaesthesia?
- Skin
- Subcutaneous tissue
- Supraspinal ligament
- Interspinal ligament
- Ligamentum flavum
- Epidural space
- Dura mater
- Arachnoid mater
- Subarachnoid space
What is the supraspinal ligament? What structures does it connect?
Connects the apices of the spinous processes along the vertebral column

What are the interspinous ligaments? What structures do they connect?
Connect spinous processes of the vertebrae

What is the ligamentum flavum? What structures does it connect?
Connects the laminae of adjacent vertebrae

Which nerve roots form the cervical plexus?
C1-C4
Which nerve roots form the brachial plexus?
C6-T1
Which nerve roots form the lumbrosacral plexus?
L2-S1