Flashcards in anatomy exam I Deck (29)
Where is Posterior triangle?
Space between trapezius, clavicle & scm
What makes up the axilla?
Triangular space between humers, rib cage @ anterior/posterior folds (pec major & lats)
How many joints in elbow, what are they?
3: Humeroulnar: trochlear notch of ulna
Humoralradial: capitulum of humerous with head of radius
Proximal radio-ulnar: head of radius with radial notch on ulnar side
What are elbow movements?
flexion, extension of forearm
pronation/ supination @proximal radial ulnar joint
Elbow joint ligaments
Ulnar collateral: triangular ligamnet with upper/lower bands- ulnar nerve passes between bands
posterior to medial epicondoyle
radial collateral: attached to annular ligamnet
annular ligament: sling around head of radius to form proximal radioulnar joint'
proximal radialulnar joint
annular ligaments permits rotation of head of radius around ulna
Interosseous membrane links bones together
area of skin innervated by one spinal segment
area of muscle innervated by 1 spinal segment
usually 2-3 segments per muscle
often evaluated by strength testing
branches from posterior cord
passes between medial/lateral head of triceps
innervates 3 heads of triceps
long thoracic nerve
descends from C5, 6, 7 innervates SA on superficial surface
Early joint development
mesenchyme (pluripoint tissue) differentiates into cartilage for future bone
CT for joints
Ct between bones differentiates into what kind of joints?
3 joints: fibrous, cartilaginous, synovial
subdermal loose connective tissue that contains fat nerves and blood vessels
thick CT that forms various protective structures
investing layer surrounds muscle groups
intermuscular septa seperates functional muscle into groups
flattened sacs in regions to reduce friction: muscle/tendon/bone
closed sac of CT devoid of air and lubricated by fluid secreted by membrane
bursa surrounding tendon
what are synovial joints supported by?
capsular and extra capsular ligamnets
How long does egg stay embyro after fertilization?
what are embryonic cells flattened into?
What's it made of?
3 germ cell layers
endoderm, mesoderm, ectoderm
Gi tract, inner lining of digestive tract, respiratory tracts, glands (inculding iver & pancreas)
Muscle, bones, cartilage, circulatory system, dermis, tissue
brain and nervous system, epidermis,
Paraxial mesoderm thickens and divides into paired masses (sides of notcord) of mesenchymal cells called SOMITES.
Beginning of spinal cord segmentation
Segmentation of spinal cord
Deep tendon reflexes
Often defined by vertebral segments
Somites seperate into?
What do segments form?
Scerlotome: vertabrae and ribs
Where do limb buds develop from/when
what do they consist of?
by week 5 appear from ventral walls of embryo
Consist of mesoderm (lateral somite) and Ectoderm (apical ectodermal ridge)
Myotome cells migrate____ and develop into ____?
What migrates with them?
limb bud, muscle and cartilage
Spinal nerves to innervate muscles
When do cartilage models of bones begin to form?