Peripheral Neuroanatomy Flashcards
define dermatome
area of the skin innervated by a particular spinal nerve root
define myotomes
muscles innervated by a particular spinal nerve root
name the dermatome regions these roots innervate at in the arm
C5, C6, C7, C8, T1 & T2
C5 - over deltoid C6 - index finger C7 - middle finger C8 - pinky finger T1 - inner arm T2 apex of axilla
name the myotome regions these regions innervate at in arm
C5, C6, C7, C8 and T1
C5 - shoulder abduction C6 - elbow flexion C7 - elbow extension C8 - finger flexion T1 - finger abduction
what does the shoulder girdle consist of in humans?
it consists of clavicle and scapula
name three muscles in shoulder girdle
rhomboids, trapezius and serrates anterior
what in winging scapula? what are the problems associated with it?
- the shoulder bone protrudes out from a person’s back
- can break down into nerve lesion
- primary muscle problem (myotomes - flexion, extension etc)
which muscle is involved in the following actions?
- shoulder abduction
- elbow flexion
- elbow extension
- wrist extension
- wrist flexion
- external arm rotation
- shoulder abduction - deltoid, tres minor
- elbow flexion - biceps
- elbow extension - triceps
- wrist extension - extensors
- wrist flexion - flexors
- external arm rotation - infaspinatus
which nerve is involved in the following actions?
- shoulder abduction
- elbow flexion
- elbow extension
- wrist extension
- wrist flexion
- external arm rotation
- shoulder abduction - axillary - C5
- elbow flexion - musculocutaneous - C5/6
- elbow extension - radial - C7/8
- wrist extension - radial - C7/8
- wrist flexion - median and ulnar - C7/8
- external arm rotation - supra scapular
which muscle is involved in the following actions?
- finger flexion
- finger extension
- finger abduction
- finger adduction
- thumb abduction
- thumb adduction
- finger flexion - flexors
- finger extension - extensor
- finger abduction - dorsal interossei
- finger adduction - palmar interossei
- thumb abduction - abductor pollicis brevis
- thumb adduction - adductor pollicis
which nerve is involved in the following actions?
- finger flexion
- finger extension
- finger abduction
- finger adduction
- thumb abduction
- thumb adduction
- finger flexion - median and ulnar - C6/7
- finger extension - radial - C7/8
- finger abduction - ulnar - T1
- finger adduction - ulnar - T1
- thumb abduction - ulnar - T1
- thumb adduction - ulnar - T1
what are the muscles of hand innervated by the median? LOAF
lateral two lumbricals
opponens pollicis
abdcutor pollicis brevis
flexor pollicis brevis
what are the muscles of hand innervated by the ulnar? HILA
hypothenar eminence
interossei
lumbricals (medial two)
adductor pollicis
name three muscles involved in arm/elbow flexion? BBC
biceps, brahcialis, coracobracialis
what happens in wrist drop, hand of Benedict and claw hand?
wrist drop - wasting of triceps (deformed wrist extension)
hand of bendiction - wasting of finger flexors
claw hand - wasting of finger extension
