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Anat1 - Shoulder

(Week 5)

QuestionAnswer
The _______ _______ is made up of the bones of the limbs and their girdles. appendicular skeleton
The _______ _______ consist of the clavicles anteriorly and the scapulae posteriorly. shoulder girdles (pectoral girdles)
The shoulder girdles provide attachment points for muscles that move the _______ _______. upper limbs
The _______ are triangular, flat bones lying on the dorsal surface of the rib cage, between the second and seventh ribs. scapulae
There are ___ borders, ___ angles, and ____ fossa on each scapula. 3,3,4
The three borders of scapulae are: superior, medial, lateral
The three angles of scapulae are: superior, inferior, and lateral
The four fossa of scapula are: infraspinous, supraspinous, subscapular, glenoid
The _______ are slender, doubly curved long bones lying across the superior thorax. clavicles
The _______ is the sole bone of the arm. humerus
The humerus articulates with the _______ at the shoulder and the _______ and _______ at the elbow. scapula, radius, ulna
The Glenohumeral, Acromioclavicular, Sternoclavicular, Sternocostal, & Scapulothoracic are all joints of the _______ _______. pectoral girdle (shoulder girdle)
The prime movers of shoulder elevation are the _______ and _______ _______. trapezius, levator scapulae
The five scapular movements are: scapulothoracic rotation, protraction, retraction, elevation, depression
The four anterior extrinsic muscles of the thorax are: pectoralis major, pectoralis minor, serratus anterior, subclavius
The four posterior extrinsic muscles of the thorax are: latissimus dorsi, trapezius muscles, levator scapulae, rhomboids
___ muscles cross the shoulder joint and insert into the humerus. 9
_______ _______ is the prime mover of arm flexion. Pectoralis major
_______ _______ and the posterior fibers of the _______ are prime movers of arm extension. Latissimus dorsi, deltoid
The _______ (middle fibers) is the prime mover of arm abduction. deltoid
The rotator cuff muscles are: supraspinatus, infraspinatus, teres minor, subscapularis
The function of the _______ _______ muscles are mainly to reinforce the capsule of the shoulder, and secondarily they act as synergists and fixators, preventing shoulder dislocation. rotator cuff
The _______ and _______ _______ do not contribute to reinforcement of the shoulder joint. coracobrachialis, teres major
The general actions of the anterior muscles crossing the shoulder are: flexion of shoulder, internal rotation
The general actions of the posterior muscles crossing the shoulder are: extension of shoulder, external rotation of shoulder (except teres major and latissimus dorsi)
The general actions of the middle/lateral muscles crossing the shoulder are: abduction
Pectoralis Minor O.I.A. O: ant surface of ribs 3-5 (book says 2-4) I: coracoid process of scapula A: scapula protraction (forward) & depression (downward), w/ scap fixed, draws rib cage up
Serratus Anterior O.I.A. O: slips from ant ribs 1-8(9) I: ant surface medial border scapula A: scap protraction & stabilize against thorax (upward rotation)
Subclavius O.I.A. O: costal cartilage of 1st rib I: inf clavicle A: stabilize and depress pectoral girdle
Upper Trapezius O.I.A. O: Occiput, nuchal lig, SP C1-7 I: lat 1/3 of clavicle A: Elevation of scapula
Middle Trapezius O.I.A. O: SP C7-T3 I: medial Acromion, Upper border scap spine A: retraction and upward rotation of scapula
Lower Trapezius O.I.A. O: SP T4-12 I: inferior medial border scap spine A: depression & downward rotation
Levator Scapulae O.I.A. O: TP C1-4 I: med border of scapula, superior to the spine of scapula A: elevation of scapula; if scap is fixed ipsilat lat flex/rot of neck
Rhomboids Major and Minor O.I.A. O: SP C7-T1 (minor) T2-5 (major) I: medial border of scap (minor root of spine, major med border spine to inf angle) A: scap retraction, stabilization, & downward rotation
Pectoralis Major O.I.A. O: sternal end of clavicle, Sternum & cartilage rib 1-6(7), (aponeurosis ext oblq) I: Greater tubercle, bicipital/intertubicular groove humerus (lateral lip) A: arm: PM of flex, medial rot, add. w/ arm & scap fixed pulls thorax up (pullups, climbing)
Latisimus Dorsi O.I.A. O: SP T7-12, indirect via thoracolumbar fascia (L1-5), illiac crest (lower 3-4 ribs) I: spirals to insert into floor of bicipital/intertubicular groove A: arm: PM of Ext Add, med rot. w/ arm fixed pulls body up, downward power stroke (hammer,swim,row)
Anterior Deltoid O.I.A. O: lat 1/3 of clavicle I: deltoid tuberosity of humerus A: flex, med/int rot, abd of humerus, pec Mj syn
Middle Deltoid O.I.A. O: Acromion I: deltoid tuberosity of humerus A: abd of humerus
Posterior Deltoid O.I.A. O: spine of scap I: deltoid tuberosity of humerus A: extension, ext rot, abd of humerus
Supraspinatus O.I.A. O: supraspinous fossa of scapula I: superior part of greater tubercle of humerus A: initiates abduction, stabilizes shoulder joint
Infraspinatus O.I.A. O: infraspinous fossa of scap I: middle part of greater tubercle of humerus A: stabilizes shoulder joint, rotates humerus laterally
Teres minor O.I.A. O: inf lat border of scap I: inf part of greater tubercle of humerus A: stabilizes shoulder joint, rotates humerus laterally
Subscapularis O.I.A. O: subscapular fossa I: lesser tubercle of humerus A: chief med rot of humerus (with pec Mj), stabilizes shoulder joint
Teres Major O.I.A. O: Post surface of scap at inf angle I: floor of bicipital/intertubicular groove shared w/ lat dorsi A: add & med rot, ext of humerus
Coracobrachialis O.I.A. O: coracoid process of scap I: medial surface of mid humerus shaft A: flex, add of arm, syn of pec Mj
Biceps Brachii (short & long head) O.I.A. O: Short: coracoid process of scap long:supraglenoid tubercle and lip of glenoid cavity; tendon of long head runs w/in capsule & into intertubercular sulcus of humerus I: radial tuberosity A: elbow flex, forearm supination; long head weak shoulder flex
Triceps Brachii (long, med, & lat head) O.I.A. O: long: infraglenoid tubercle of scap, lat: post shaft of humerus, med: post humerus distal to radial groove I: common tendon to olecranon process of ulna A: PM of elbow ext, antagonist of elbow flex
Created by: sdouglass