Question

you sense the lady bug has landed on the dorsum of your left hand. trace the path of sensory information to the brain. for each of the following steps, select the correct description from the three the option to the right.

step 1

a. tactile disc

b. bulbous corpuscle

c. lamellated corpuscle

step 2

a. radial nerve

b. brachial nerve

c. ulnar nerve

step 3

a. brachial plexus

b. cervical plexus

c. lumar plexus

step 4

a. spinal cord between L1-L4

b. spinal cord between C1-C4

c. spinal cord between C5-T1

step 5

a. lateral spinothalamic path

b. anterior spinothalamic path

c. PF-ML path

step 6

a. left somatosensory cortex

b. right post central gyrus

c. right precentral gyrus

1. did decussation occur?

if so, where?

2. where did the secondary neuron synapse with the tertiary neuron? rSp_H001

Answer 1

ANSWER :

Tracing the sensory information pathway to brain, when a lady bug landed on the dorsum of the left hand :-

Tactile disc receptor > Radial nerve > Brachial plexus > Spinal cord between C5 to T1 > Anterior spinothalamic tract > Right postcentral gyrus

1. Afferent axon fibres decussate in anterior white commissure to ascend in anterior spinothalamic tract.

2. The secondary neuron synapses with third order neuron in the ventral posterolateral nucleus of thalamus.