Posterior Muscles of the Trunk

Question 1

External abdominal oblique, internal abdominal oblique, and serratus anterior muscles

Answer 1

Location: lying under the protection of the latissimus dorsi

Question 2

Latissimus Dorsi Muscle (Location)

Answer 2

Location: originates from the lower six thoracic vertebrae

Question 3

Lumbodorsal Fascia and Crest of the ilium (location)

Answer 3

Insert upon the bicipital groove of the humerus

Question 4

Latissimus Dorsi Muscle (Function)

Answer 4

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

Question 5

Trapezius

Answer 5

Large triangular sheet
Location: originate from the occipital bone as well as all of the cervical and thoracic vertebrae to insert upon the lateral third of the clavicle, the spine of the scapula and the acromion proess on eiterh sider.

Question 6

Deltoid Muscle

Answer 6

Originate from the insertion points of the trapezius (Two muscles are believed to be the same)

Question 7

Triceps Brachii

Answer 7

Location: seen along the dorsal surface of the humerus

Question 8

Sternocleidomastoid Muscle

Answer 8

Location: insertion point is shown at the mastoid process of the temporal bone and along the superior nuchal line of the occipital bone

Question 9

Erector Spinae Muscles

Answer 9

Series of muscle segments

Location: begin from the sacrum and iliac crest to extend up to the base of the skull

Question 10

Semispinalis Capitis

Answer 10

Consists of numerous muscular slips

Location: extend from the upper six thoracic vertebrae to the occipital bone

Question 11

Erector Spinae and Semispinalis

Answer 11

Function: Are important muscles that serve to extend and laterally rotate the spine

Question 12

Levator Scapulae (Location)

Answer 12

Deep to the trapezius muscles,

Location: extending from the first four cervical vertebrae to the superior angle of the scapula on either side

Question 13

Levator Scapulae (Function)

Answer 13

Function: acting to pull the scapulae upwards and medially

Question 14

Rhomboideus major and minor (Location)

Answer 14

Location: arise from the vertebral spines of cervical 7 through thoracic 5 and insert along the medial border of the scapula btwn the spine and inferior angle

Question 15

Rhomboideus major and minor (Function)

Answer 15

Function: act to adduct and rotate the scapulae

Question 16

Supraspinatus and Infraspinatus muscles (Location)

Answer 16

Location: originating above and below the scapular spine respectively, with both muscles attaching to the greater tuberosity of the humerus and capsule of the shoulder joint

Question 17

Supraspinatus and Infraspinatus muscles (Function)

Answer 17

Function: two muscles act to support the head of the humerus within the glenoid fossa, providing stability to the joint during the actions of other shoulder muscles, especially the deltoids

Question 18

Triangle of auscultation (Location)

Answer 18

Location: situated above the horizontal border of the latissimus dorsi, with the vertebral border of the scapula along with the lower edge of trapezius completing the traingle

Question 19

Triangle of auscultation (Function)

Answer 19

Function: utilized in examination of the heart, lungs, esophagus, and stomach using a stethoscope

Question 20

Lumbar triangle (Location)

Answer 20

Location: exposed portion of the internal abdominal oblique muscle, bordered by the inferior edges of the latissimus dorsi and the external abdominal oblique muscles along with the crest of the ilium

Question 21

Lumbar triangle (Function)

Answer 21

Function: may be the location a rare intestinal hernia