ILA: SPINAL/PERIPHERAL NERVES Flashcards
What mediates the upstroke and downstroke of a nerve action potential?
Upstroke - Na+ influx
Downstroke - K+ efflux
What does the peripheral nervous system refer to?
Refers to parts of the nervous system outside the brain and spinal cord - includes the cranial nerves, spinal nerves and their roots and branches, peripheral nerves, and neuromuscular junctions.
Which group of spinal nerves innervates the biceps reflex?
C5/C6
Which group of spinal nerves innervates the ankle reflex?
S1/S2
A 78 year old lady presents to her GP with an intensely itchy vesicular rash in two separate horizontal lines at the level of the nipple and umbilicus respectively. Which dermatomal distribution is this affecting?
T4 and T10
A 78 year old lady presents to her GP surgery with an intensely itchy vesicular rash in a horizontal line at the level of the nipple. What is the most likely diagnoses?
Shingles
Which cell type listed below is not found in the central nervous system?
- Astrocytes
- Schwann cells
- Ependymal cells
- Microglia
- Oligodendrocytes
Schwann cells
A sexually promiscuous older gentleman presents with a stamping gait. He is diagnosed with tabes dorsalis. On examination he has a loss of joint position sense and cannot feel the tuning fork when placed on his medial malleolus. Which spinal tract is affected?
Dorsal collum medial lemiscus pathway
A 48 year old obese diabetic man, who smokes 30 a day presents with bilateral “glove and stocking” loss of pain, temperature and pin prick sensation. Which spinal tract is affected?
Spinothalamic
Which descending motor tract originates in the cerebral cortex and synapses in the spinal cord?
Corticospinal
Where does the spinothalamic tract decussate?
Spinal cord
What is the vagus nerve composed of?
Parasympathetic motor and sensory fibres
