Anatomy Chapter 10.7 mod.

interubercular sulcus

all fibers of pectoralis major muscle converge on the lateral edge of the _______________.

spinal accessory nerve

all fibers of the trapezius muscle are innervated by the _____________.

humeral head

all the tendons of the rotator cuff muscles combine at which location?

supraspinatus muscle

downward dislocation of the humerus from the glenohumeral joint when carrying weight is prevented by the __________.

d

identify the levator ani muscle

ischiocavernosus; ischiala tuberosities

what is the name and origin of the musclel at A?

c

which muscle inserts on the greater tubercle of the humerus? the infraspinatus typically originates on the infraspinous fossa of the scapula and inserts into the greater tubercle of the humerus posterior to the insertion of supraspinatus.

teres major muscle

which muscle is not part of the rotator cuff?

distribution and functional relationship

muscles of the shoulder can be divided into groups based on __________.

deltoid

of the nine muscles that cross the shoulder joint and insert on the humerus, which muscle is considedered to be a prime mover?

adduct the arm

one of the actions of the latissimus dorsi muscle is to _____________________.

teres major

the ________ is a synergist of the latissimus dorsi; it extends, medially rotates, and adducts the humerus.

hernia

the abnormal protrusion of the small intestine through a weak point in the muscle of the abdominal wall is called a ____________.

forced expiration

the actions of the internal intercostals are most important during __________.

compression of the abdomen to assist in forced expiration

the actions of the internal obliques include ____________________.

subscapularis

the angle of which muscle prevents the humeral head from sliding upward out of the joint as the arm is raised?

true

the anterior axial muscle that crosses the glenohumeral joints is the pectoralis major muscle.

anterior, middle, and posterior

the deltoid muscle fibers are seperated into __________________.

inspiration

the external intercostals elevate the rib cage during ____________.

greater tubercle of the humerus

the infraspinatus inserts on the ____________ of the humerus.

rotator cuff

the infraspinatus muscle is included in the __________ muscles.

greater tubercle of the humerus

the insertion of the supraspinatus muscle is on the __________.

greater tubercle of the humerus

the insertion of the teres minor is on the __________.

medial rotation and adduction

the key actions of the pectoralis major muscles are __________.

on the intertubercular groove of the humerus

the latissimus dorsi inserts _____________________.

abduct the arm

the middle fibers of the deltoid muscle __________________.

five through twelve

the origin of the external obliques includes ribs ________________.

8

the origin of the serratus anterior includes __________ ribs.

pectoral nervous

the pectoralis minor muscle is innervated by the __________.

clavicular (superior) sternocostal (inferior)

the pectoralis muscle can be divided into groups of fiers superior, or __________, and inferior, or __________.

latissimus dorsi

the posterior axial muscle that crosses the glenohumeral joint is the ___________________________.

glenohumeral joint

the rotator cuff is a term used to describe the group of muscles and tendons that stabilize and reinforce the __________.

lesser tubercle of the humerus

the subscapularis muscle inserts on the __________.

to initiate abduction of the arm, to stabilize the shoulder joint and to help prevent downward dislocation of the humerus

the supraspinatus is named for its location on the posterior aspect of the scapula above the spine. What is its action?

abduct

the teres major adducts the arm but does not _______________ the arm

lateral

the trapezius muscle may be separated into all of the following groups, except __________.

the shoulder joint

which joint is considered the most flexible joint in the body?

d

which msucle is innervated by the S3 nerve, S4nerve, and the inferior rectal nerve (a branch of the pudendal nerve)? The levator ani muscles are innervated by several nerves including the pudendal, while the other muscles indicated are innervated by the pudendal nerve alone.

a

which muscle is a prime mover of arm abduction? this muscle originates along the spine and ribs and inserts into the humerus. it is a powerful actor during chin-ups

d

which muscle is known as the "boxer's muscle" for its ability to move the arm horizontally, as in throwning a punch? the serratus anterior can be used to violentally pull the scapula laterally and thus pull the shoulder forward, adding strength to a horizontal punch.

a

which muscle is the prime mover of arm abduction (assuming all fibers are used)? the deltoid muscle has three sets of fibers. if all three are activated, the arm is abducted at the shoulder.

the anterior flexor muscles

which of the following groups of muscles are not muscles of the shoulder?

pectoralis major; arm abduction

which of the following is INCORRECTLY paired? the pectoralis major adductions the arm.

teres major

which of the following is NOT a rotator cuff muscle? teres major is not one of the four rotator cuff muscles. their main function is to reinforce the capsula of the shoulder and rotate the humerus in the glenoid cavity.

latissimus dorsi

which of the following is not a muscle primarily involved in the breathing process?

deltoid

which of the following muscles is known on this image but its NOT indicated with a letter? the deltoid, located in the upper right hand of the image, originates at the acromion of the scapula and inserts into the deltoid tuberosity of the humerus.

brachialis

which of the following muscles is not part of the shoulder?