Anatomy Flashcards
Anatomical planes
Median:
- midline plane that divides into L and R halves
Sagittal:
- divides into L and R parts
- infinite number of sagittal planes parallel to mid-sagittal plane
Coronal:
- divides into front and back
- aka frontal plane
Transverse:
- divides into top and bottom
- aka horizontal plane, aka axial plane
Levator scapula
spacular elevation
dorsal scapular n.
Rhomboid minor/major
scapular elevation, retraction
dorsal scapular n.
Latissumis dorsum
arm extension, adduction, medial rotation
thoracodorsal n.
Deltoids
arm abduction
axillary n.
Trapezius
upper fibers: scapular elevation, upward rotation
middle fibers: scapular retraction
lower fibers: scapular depression, upward rotation
accessory n.
Intermediate back muscles
serratus posterior superior, serratus posterior inferior
respiratory muscles
Deep/intrinsic intermediate muscles
erector spinae: spinalis, iliocostalis, longissimus
vertebral column and head movements
Shoulder ligaments, muscles
Ligaments:
- acromioclavicular ligament (weak)
- coracoacromial ligament (weak)
- coracoclavicular ligament (strong) <- if torn, you get a 3rd degree shoulder separation
Rotator cuff muscles:
- supraspinatus
- infraspinatus
- teres minor
- subscapularis
Supraspinatus
rotator cuff muscle; initial abduction (0˚-15˚)
suprascapular n.
empty can test
- supraspinatus travels deep to the coracoacromial arch; the proximity of the bones and ligaments of this arch makes the supraspinatus easily injured
- most commonly injured rotator cuff muscle
Infraspinatus
rotator cuff; lateral rotation of arm
suprascapular n.
Subscapularis
medial rotation of arm
upper and lower subscapular n.
Teres minor
lateral rotation
axillary n.
Teres major
medial rotation, extension
lower subscapular n.
Axillary n.
C6, C7 (posterior cord of brachial plexus)
innervates deltoid, teres minor
innervates skin of lateral upper arm
injured in humerus fracture of surgical neck
Axillary foramens
Suprascapular foramen - suprascapular n.
Quadrangular space - axillary n., posterior circumflex humeral a.
Triangular space - circumflex scapular a.
Triangular interval - radial n., profunda brachii a. (mid-shaft humeral fracture)
Pectoralis major
arm adduction, flexion, medial rotation
medial & lateral pectoral n.
Pectoralis minor
shoulder depression, scapular protraction, forced inspiration
medial pectoral n.
Subclavicus
clavicular depression
n. to sublavicus
Serratus anterior
spacular protraction and rotation, holds scapula to thoracic wall
long thoracic n.
winged scapula
Clavipectoral/Deltopectoral triangle
hole in clavipectoral fascia that allows cephalic vein to exit axilla
Veins down arm/forearm
medial cubital vein ==> cephalic v. (lateral) + basilic v. (medial)
basilic v. ==> axillary v. ==> subclavian v.
Axillary artery
starts at 1st rib and ends below teres major
3 parts:
1. 1st rib to superior aspect of pectoralis minor
2. superior aspect of pec minor to inferior aspect
3. inferior aspect of pec minor to teres major
1st part of axillary a.
superior thoracic a.