Muscles of the Neck, Shoulder, Thorax, Abdomen

Question 1

superficial neck muscle which originates along the clavipectoral fascia and inserts at the inferior border of the body of the mandible. The action of this muscle is to elevate the skin of the neck

Answer 1

platysma

Question 2

what is the origin, insertion, action, and innervatior of the Sternocleidomastoid

Answer 2

origin: manubrium of the sternum and clavicle
insertion: mastoid process of the temporal bone
action: flexion of the head (if both sides are innervated stiumultaneusly) or rotation of the head toward the opposite side (if only one side is innervated)

Innervation: CN XI, Accessory Nerve

Question 3

what is the origin, insertion, action, and innervation of the trapezius?

Answer 3

origin: skull, cervical and thoracic vertebrae
insertion: clavivle, acrombion, spine of scapula
action: upward rotation, elevation and depression of the scapula
innervation: (CN XI) Accessory Nerve

Question 4

what is the origin, insertion, action, and innervation of the deltoid?

Answer 4

origin: spine of the scapula, acromion, clavicle
insertion: deltoid tuberosity of the humerus
action: flexion, extension, abduction medial and latrial rotation of the arm at the shoulder joint
innervation: axially nerve

Question 5

what is the origin, insertion, action and innervation of the pectoralis major?

Answer 5

origin: clavicular part- medial half of the clavicle, sternocostal part- sternum and first 5 costal cartilages
insertion: crest of greater tubercle of humerus
action: adduction, medial rotation and flexion of the arm at the shoulder joint
innervation: medial and lateral pectoral nerves

Question 6

what is the origin, insertion, action and innervation of the pectoralis minor?

Answer 6

origin: ribs 2-5
insertion: coracoid process of the scapula
action: depression of the scapula
innervation: medial pectoral nerve

Question 7

what is the origin, insertion, action and innervation of the serraatus anterior?

Answer 7

origin: ribs 1-8
insertion: medial border of the scapula
action: upward rotation of the scapula
innervation: long thoracic nerve

Question 8

what is the origin, insertion, action and innervation of the external oblique?

Answer 8

origin: lower 8 ribs. interdigitates with the latissimus dorsi and serratus anterior muscles
insertion: iliac crest and rectus sheath via an apoheurosis
action: rotation and lateral flexion of the trunk, forced expiration
innervation: throacoabdominal nerves (t7-t11) and the subcostal nerves (t12)

Question 9

what is the origin, insertion, action and innervation of the internal oblique?

Answer 9

origin: iliac crest
insertion: costal margin. rectus sheath via aponeurosis, pubic crest
action: rotation and lateral flexion of the trunk, forced expiration
innervation: throacoabdominal nerves (t7-t11) and Subcostal nerves (t12)

Question 10

what is the origin, insertion, action and innervation of the transversus abdominis?

Answer 10

origin: iliac crest, lower 6 costal cartilages and gascia of the back
insertion: rectus sheath via aponeurosis
action: rotation and lateral flexion of the trunk, forced expiration
innervation: throacoabdominla nerves (t7-t11) and subcoastal nerves (t12)

Question 11

what is the origin, insertion, action and innervation of the rectus abdominis?

Answer 11

origin: xiphoid process and costal cartilages of rib 5-7
insertion: pubic crest and symphysis
action: flexion of the trunk
innervation: throaco-abdominal nerves (t7-t12) and subcostal nerves (t12)

Question 12

what does the aponeurosis of the external oblique form?

Answer 12

inguinal ligament

Question 13

which muscles share the

origin: iliac crest
action: rotation and laterial flexion of the trunk, forced expiration
innervation: throaco-abdominal nerves t7-t11 and subcostal nerves t12

Answer 13

transversus abdominis

internal oblique

Question 14

which muscles share the

action: rotation and laterial flexion of the trunk, forced expiration
innervation: throaco-abdominal nerves t7-t11 and subcostal nerves t12

Answer 14

transversus abdominis

internal oblique

external oblique

Question 15

which muscles share the

innervation: throaco-abdominal nerves t7-t11 and subcostal nerves t12

Answer 15

rectus abdominis

transverse abdominis

internal oblique

external oblique

Question 16

which muscles share the innervation of the accessory nerve?

Answer 16

trapezius

sternocleidomastoid