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Anat1 - Shoulder
(Week 5)
| Question | Answer |
|---|---|
| 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
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