Chapter 17: Muscles Part 2

Human Anatomy 2350 with Gardener at Snow College

About this deck

By: Lucas Robinson
Textbook:

Human Anatomy

Human Anatomy
Created: 2012-03-02
Size: 36 flashcards
Views: 177

About StudyBlue

STUDYBLUE makes things that make you better at school. Things like online flashcards with photos and audio. Things like personalized quizzes and friendly reminders about when (and what) to study next. Think of it as a digital backpack™: access to all of your study materials online and on your phone. STUDYBLUE exists to make studying efficient and effective for every student, for free. Join us.

“Simply amazing. The flash cards are smooth, there are many different types of studying tools, and there is a great search engine. I praise you on the awesomeness.”
Dennis

Sign up (free) to study this.

pectoralis minor

Identify: Origin - sternal ends of the 3rd, 4th, and 5th ribs. Insertion - coracoid process of the scapula. Action - pulls scapula forward and downward.

serratus anterior

Identify: Origin - external surfaces of lateral parts of ribs 1-8/9. Insertion - anterior vertebral border of the scapula. Action - pulls scapula forward and downward.

trapezius

Identify: Origin - medial 1/3 of superior nuchal line, external occipital protuberance, nuchal ligament & spines of C7 & all thoracic vertebrae. Insertion - lateral third of clavicle, acromion process, & spine of scapula. Action - elevates, retracts, rotates scapula.

levator scapulae

Identify: Origin - posterior tubercles of transverse process of C1-C4. Insertion - superior part of vertebral border of scapula. Action - elevates scapula and tilts its glenoid cavity inferiorly by rotating scapula.

rhomboideus minor

Identify: Origin - inferior portion of nuchal ligament and spinous processes of C7-T1. Insertion - vertebral border of the scapula just below the level of the spine. Action - adducts scapula and rotates it.

rhomboideus major

Identify: Origin - spinous process of T2-T5. Insertion - vertebral border of the scapula from the inferior border of the rhomboideus minor to the inferior angle of the scapula. Action - adducts scapula and rotates it to depress glenoid cavity.

latissimus dorsi

Identify: Origin - spines of sacral, lumbar, and lower thoracic vertebrae; iliac crest and lower 4 ribs. Insertion - intertubercular groove of the humerus. Action - extends, adducts, and rotates humerus medially; retracts shoulder.

pectoralis major

Identify: Origin - clavicular head: anterior surface of medial half of clavicle. Sternocostal head: anterior surface of sternum, superior six costal cartilages & aponeurosis of external abdominal oblique. Insertion - crest of greater tubercle of humerus. Action - adducts & medially rotates humerus.

deltoid

Identify: Origin - clavicle, acromion process, spine of the scapula. Insertion - deltoid tuberosity of the humerus. Action - anterior part: flexes and medially rotates arm. Middle part: abducts arm. Posterior part: extends and laterally rotates arm.

coracobrachialis

Identify: Origin - coracoid process of the scapula. Insertion - middle third of medial surface of humerus. Action - flexes and adducts arm at shoulder joint.

teres major

Identify: Origin - inferior ange and lateral border of scapula. Insertion - crest of lesser tubercle of the humerus. Action -medially rotates and adducts arm

subscapularis

Identify: Origin - subscapular fossa. Insertion - lesser tubercle of humerus. Action - extends humerus, adducts and rotates arm medially.

supraspinatus

Identify: Origin - supraspinous fossa of the scapula. Insertion - greater tubercle of the humerus. Action - abducts and laterally rotates humerus

infraspinatus

Identify: Origin - infraspinous fossa of the scapula. Insertion - greater tubercle of the humerus. Action - rotates arm laterally.

teres minor

Identify: Origin - superior part of axillary border of scapula. Insertion - greater tubercle of humerus. Action - rotates arm laterally.

subscapularis

supraspinatus

infraspinatus

teres minor

list the four muscles that make up the rotator cuff.

hold head of humerus in glenoid cavity during movements

what is the main function of the rotator cuff?

deep fascia

what separates the limbs into compartments?

anterior (flexor) compartment

posterior (extensor) compartment

what two compartments occur in the brachium?

biceps brachii

Identify: Origin - short head: coracoid process of scapula. Long head: supraglenoid tubercle of scapula. Insertion - radial tuberosity and fascia of forearm via bicipital aponeurosis. Action - flexes and supinates forearm.

brachialis

Identify: Origin - distal half of anterior shaft of the humerus. Insertion - coronoid process of ulna. Action - flexes elbow.

brachioradialis

Identify: Origin - proximal two thirds of lateral supracondylar ridge of humerus. Insertion - lateral surface of distal end of radius. Action - flexes elbow.

triceps brachii

Identify: Origin - long head: infraglenoid tubercle of scapula. Lateral head: posterior surface of humerus superior to radial nerve groove. Medial head: posterior surface of humerus inferior to radial nerve groove. Insertion - olecranon process of ulna. Action - extends forearm. Long head steadies head of abducted humerus.

pronator teres

Identify: Origin - medial epicondyle of the humerus and coronoid process of ulna. Insertion - middle of lateral surface of the radius. Action - pronates forearm.

pronator quadratus

Identify: Origin - distal fourth of anterior surface of ulna. Insertion - distal fourth of anterior surface of radius. Action - pronates hand.

supinator

Identify: Origin - lateral epicondyle of the humerus and crest of the ulna. Insertion - lateral surface of the proximal third of radius. Action - supinates forearm.

flexors

Identify this group of muscles in the anterior forearm: Origin - medial epicondyle of the humerus; anterior, proximal ulna and radius; interosseous membrane. Insertion - carpals, metacarpals, and phalanges. Action - flex wrist and digits.

extensors

Identify this group of muscles in the posterior forearm: Origin - lateral epicondyle of the humerus; posterior surfaces of the radius and ulna; interosseous membrane. Insertion - carpals, metacarpals, and phalanges. Action - extend wrist and digits.

carpal ligament

what is another name for the flexor retinaculum of the wrist?

carpal tunnel

the flexor retinaculum of the wrist and the arch of the carpals form what structure?

thenar group

what group of muscles forms the thick, fleshy mass at the base of the thumb and work to abduct, flex, or oppose the thumb?

hypothenar group

what group of muscles forms the small fleshy mass at the base of the fifth digit of the hand and work to abduct, flex, and oppose the fifth digit?

midpalmar group

within the hand, what group of muscles lies between the 1st and 5th digits?

lumbrical muscles

Identify: Origin - tendons of a flexor which sends a tendon to the distal phalanx of digits 2-5. Insertion - lateral sides of extensor expansions of digits 2-5. Action - flex digits ate metacarpophalangeal joints and extend interphalangeal joints

dorsal interossei

Identify: Origin - adjacent sides of two metacarpal bones. Insertion - extensor expansions and bases of proximal phalanges of digits 2-4. Action - abducts digits 2-4.

palmar interossei

Identify: Origin - palmar surfaces of metacarpals 2,4, and 5. Insertions - extensor expansions of digits and bases of proximal phalanges of digits 2,4, and 5. Action - adduct digits 2,4, and 5.