Neurologic Exam Week 1

Where are sensory nerves in the spinal cord?

Dorsal

Where are motor nerves in the spinal cord?

Ventral

Which sensory receptors detect pressure?

Merkel's discs

Which sensory receptors detect 2 point touch?

Meissner's corpuscles

Which sensory receptors detect joint positioning and stretch?

Ruffini endings

Which sensory receptors detect vibration?

Pacninian corpuscles

Which sensory receptors detect soft/safe touch?

C-fibers

Which sensory receptors detect injurious forces?

Polynodal nociceptors

Where is the primary somatosensory cortex?

Parietal lobe (postcentral gyrus)

Which sensory fibre type transmits muscle proprioceptive information?

Aa

Which sensory fibre type is the fastest?

Aa

Which sensory fibre type transmits touch/tactile information?

Ab

Which sensory fibre type transmit fast pain/temperature information?

Ad

Which sensory fibre type transmits slow/chronic pain and temperature and itch information?

C

What speeds do sensory information travel at?

Aa - 80-120 m/s

Ab - 35-90 m/s

Ad - 5-40 m/s

C - 0.5-2 m/s

T or F: Larger diameter nerve fibers have more myelin

True

Which types of sensory fibres make up the lateral spinothalamic tract?

Ad and C fibres

What types of sensory fibres make up the dorsal column / medial lemniscus tract?

Aa and Ab fibers

What tract does a pinwheel test?

Spinothalamic

What tract does a cotton wisp test?

Spinothalamic

What tract does a 128 Hz tuning for test?

Dorsal columns

What tract does a 2 point discrimination tool test?

Dorsal columns

T or F: You look for differences in sensation between the same dermatome bilaterally and different dermatomes unilaterally

True

Which sensations to you test to quickly assess the primary somatosensory cortex?

Pain and vibration

Which landmark is used for testing the C5 dermatome?

Anterolateral deltoid

Which landmark is used for testing the C6 dermatome?

Lateral forearm, anterior thumb, anterior index finger

Which landmark is used for testing the C7 dermatome?

Middle finger

Which landmark is used for testing the C8 dermatome?

Pinky finger, medial wrist, medial forearm

Which landmark is used for testing the T1 dermatome?

Medial elbow

Which landmark is used for testing the L1 dermatome?

Inguinal region

Which landmark is used for testing the L2 dermatome?

Proximal thigh

Which landmark is used for testing the L3 dermatome?

Distal thigh

Which landmark is used for testing the L4 dermatome?

Medial shin, medial foot

Which landmark is used for testing the L5 dermatome?

Lateral shin

Dorsum of the foot INCLUDING the big toe

Which landmark is used for testing the S1 dermatome?

Lateral heel, lateral foot

Which landmark is used for testing the S2 dermatome?

Postero-medial calf and heel

Which dermatome does the lateral foot test?

S1

What dermatome is the big toe?

L5

What must a patient do during every single sensory exam?

Close their eyes