Anterior Muscles of the Trunk

Question 1

External Abdominal Oblique

Answer 1

Large portion of the superifical abdominal trunk musculature
Location: muscles that orginate as finger like digitations from the lower eight ribs on either side
Upper four projections of the eternal oblique intertwine with fibers of the serratus anterior, and lower four projectons are joined by fibers of the massive latissimus dorsi muscles of he back

Question 2

Pectoralis Major (location)

Answer 2

Locations: muscles arise from the medial half of the clavicle, the manubrium and body of the sternum and the costal cartilages of the upper six ribs to insert upon the lateral lip of the intertubercular (bicipital) groove of the humerus

Question 3

Pectoralis Major (function)

Answer 3

Function: act to adduct, flex and rotate the arm medially

Question 4

Deltoid (function)

Answer 4

Forming the roundness of the shoulders are these dense muscles with anterior fibers
Three separate actions

Question 5

Deltoid (Location)

Answer 5

Originates from the lateral third of the clavicle, as well as posterior fibers that arise from the acromion process and spine of the scapula. Tapers to a single point of insertion upon the deltoid tuberosity of the humerus.

Question 6

Deltoid ( anterior fibers function)

Answer 6

anterior fibers assist the pectoralis major in flexion of the arm,

Question 7

Deltoid (Posterior fibers function)

Answer 7

the posterior fibers assist the latissimus dorsi in extension of the arm

Question 8

Deltoid (acromial fibers function)

Answer 8

while the acromial fibers abduct the arm once this action has been initated by the supraspinatus muscle

Question 9

Internal Abdominal Oblique

Answer 9

Location deep to the external abdominal oblique, contain fibers running at nearly 90 degrees to the external on each side

Question 10

Transverse Abdominis

Answer 10

Location: deepest of these abdominal wall muscles, running horizontally from the costal cartilages of the lowest six ribs and iliac crest to the linea alba

Question 11

Linea Alba

Answer 11

MIdline band of dense white connective tissue

Question 12

Rectus Abdominis Muscles

Answer 12

Extend from the pubic symphysis and crest of the pubis to the xiphoid process of the sternum and cartilages of rib pairs 5, 6 and 7.
Includes tendinous intersections that end medially at the linea alba, often dividing the muscles in six bundles (Six pack)

Question 13

Four abdominal muscles

Answer 13

External, internal transverse and rectus abdominis

Act together to compress the abdomen and help support the abdominal viscrea

Question 14

Pectoralis Minor

Answer 14

Location: deep to the pectoralis major
Aris from ribs 3, 4 and 5 and attach to the coracoid process of the scapula on each side
Function: acting to pull the shoulders forward

Question 15

Sternocleidomastoid and Stenohyoid muscles

Answer 15

Location: originate from the manubrium of the sternum and the medial portion of the clavicle

Question 16

Trapezius Muscle

Answer 16

Location: upper end of the deltoid muscle is said to extend above the clavicle into the neck

Question 17

Biceps Brachii muscle

Answer 17

Location: arise from the scpula by two heads (Short head from the coracoid process, and the long head from the supraglenoid tuberosity)
Inserts upon the radial tuberosity of the radius thereby acting acorss two joints, (Shoulder and elbow)
Function: Flex both joints and supinate the hand