Week 7 appendicular muscles Flashcards
Muscles on lateral side of body
abductors (move away from mid line)
Muscles on medial side
adductors
Muscles on inner surfaces of a joint
flexors
muscles on outer surfaces of a joint
extensors
splanchopleure
mesoderm + endoderm
Somatopleure
mesoderm + ectoderm
3 layers of mesoderm
epimere, hypomere, mesomere
which layer of mesoderm gives rise to somites
epimere
3 divisions of somites
dermatome, myotome, and sclerotome
radial nerve
supplies the extensor muscles of the upper extremity
ulnar and median nerves
supply the flexor muscles of the upper extremity
only ventral rami form
a plexus
dorsal rami
extend
ventral rami
flex
brachioradialis action
flex elbow
anconeus action
extension elbow
extensor carpi radialis action
extension and abduction of wrist
extensor carpi ulnaris action
extension and adduction of wrist
Toes are
flexors
tibialis and fibularis muscles are
extensors
Normal resting membrane potential tends to
force K+ out of cell
normal resting membrane potential tends to
drive Na+ inside
Epimysium
muscle
Perimysium
fascicles
Endomysium
muscle fiber
sliding filament
muscle contraction
Cross-bridge formation
activated myosin head attaches to action forming the cross bridge
power stroke
myosin head pivots and pulls actin toward center
detachment
requires ATP, now active site is available to form another cross bridge
serial homologies
similar structor on different locations
Cranial ventral
obturator
cranial dorsal
femoral
caudal ventral
tibial
caudal dorsal
peroneal
