Anatomy Lab: Practical two

Question 1

My action is that I draw the scalp BACK, I raise the eyebrows and wrinkle them

Answer 1

Frontalis Muscle

Question 2

My action is that I close the jaw, elevate and retract the mandible, I also maintain the mandible at rest

Answer 2

Temporalis Muscle

Question 3

My action is a PRIME MOVER for closing the jaw, raises and retracts the mandible. I also clench teeth

Answer 3

Masseter Muscle

Question 4

My action is that I close the lips, protrude the lips and help with kissing and whistling

Answer 4

Orbicularis Oris

Question 5

My origin starts at the manubrium of the sternum and the medial aspect of the clavicle.
I insert at the mastoid process of the temporal bone.
My action is a PRIME MOVER to bilaterally flex the neck as well as flex and tilt the head laterally

Answer 5

Sternocleidomastoid

Question 6

My action is that I close the eye and causes squinting

Answer 6

Orbicularis Oculi

Question 7

My action is that I depress the mandible and the lower lip. I also tense and wrinkle over the neck

Answer 7

Platysma

Question 8

Pectoralis Major

Answer 8

O: Medial Clavical, Manubrium and body of the sternum, 1-7 cartilage of ribs
I: Greater tubercle of humerus
A: (1) PM: Flexes the arm (2) PM: Adducts the arm and rotates arm medially

Question 9

Pectoralis Minor

Answer 9

A: When ribs are fixed-pulls the scapula and holds it against the chest wall, when the scapula is fixed, draws ribcage superiorly

Question 10

Serratus Anterior

Answer 10

A: PM-Protracts the scapula and holds it against the chest wall. I also abduct and raise the arms

Question 11

External Intercostals (hint: inhale)

Answer 11

My action is that I elevate the rib cage and increase thoracic volume. I am also a synergist of the diaphragm

Question 12

Internal Intercostals (Hint: exhale)

Answer 12

My action is that I depress the ribs, decreasing thoracic volume and I am an antagonist to external intercostals

Question 13

External Abdominal Oblique

Answer 13

O: Outer surfaces of the lower 8 ribs
I: Linea Alba via aponeurosis and some fibers into anterior portion of the iliac crest and pubic crest
A: Compresses the abdominopelvic cavity and assists in flexing and rotating the the vertebral column

Question 14

Internal Abdominal Oblique

Answer 14

My action is the exact same of the External Abdominal Oblique

Question 15

Transverse Abdominis

Answer 15

My action is that I compress the abdominopelvic cavity

Question 16

Rectus Abdominus

Answer 16

O: Pubic Crest and the symphysis
I: Xiphoid process of the sternum
A: Flex and rotate lumbar region of the vertebral column and stabilize pelvis during walking

Question 17

Diaphragm

Answer 17

O: Internal- Inferior surface of the rib cage and sternum, costal cartilages of the last 6 ribs and lumbar vertebrae
I: Central Tendon of Diaphragm
A: PM of respiration - When contracted, pulls central tendon down, increases thoracic volume

Question 18

Trapezius

Answer 18

O: Occipital protuberance and ligament nuchae
I: Lateral 1/3 clavicle, acromium and spine of scapula
A: Elevates the scapula (upper fibers): depress the scapula (lower fibers); adducts the scapula and rotates

Question 19

Lattissimus Dorsi

Answer 19

O: Indirect via lumbosacral fascia into spines of vertebrae T7-L5 upper 2-3 segments of sacrum, lower 3-4 ribs and iliac crest
I: Intertubercular groove of humerus
A: PM-Extends/Adducts the Arms and medial rotation of the arm at shoulder; depresses scapula

Question 20

Levator Scapulae

Answer 20

My action is to elevate and adduct the scapula. I aslo flex the neck laterally

Question 21

Rhomboid Major

Answer 21

My action is that I adduct the scapula

Question 22

Rhomboid Minor

Answer 22

My action is that I adduct the scapula??

Question 23

Supraspinatus

Answer 23

My action is that I stabilize the shoulder; assists in abducting the scapula

Question 24

Infraspinatus

Answer 24

My action/PM is the lateral rotation of the humerus and I assist in adducting the scapula

Question 25

Subscapularis

Answer 25

My action/PM is that i’m involved in the medial rotation of humerus

Question 26

Teres Major

Answer 26

My action is adduction, medial rotation and posteromedially extension of humerus

Question 27

Teres Minor

Answer 27

My action/PM: lateral rotation of the humerus and the adduction of humerus

Question 28

Deltoid

Answer 28

O: Lateral 1/3 clavicle and the acromium and spine of scapula
I: deltoid tuberosity of humerus
A: PM (anterior fibers) Flexion and medial rotation of the arm (posterior fibers) Extension and lateral rotation of the arm

Question 29

Biceps Brachii

Answer 29

O: (Long head) Tubercle and superior border of the glenoid cavity (short head) coracoid process of the scapula
I: Radial Tuberosity
A: PM- Flexes the elbow supports in supinating the forearm

Question 30

Triceps Brachii

Answer 30

O: (Long Head) infraglenoid tubercle of scapula (lateral head) humerus, upper posterior shaft (medial head) humerus, posterior shaft distal to the radial groove
I: Olecranon progress of ulna
A: (Long head) PM- Extends the forearm against resistance and adducting arm (Lateral head) PM- Extends the forearm against resistance (Medial head) PM-Extends the forearm

Question 31

Brachialis

Answer 31

O: Inside the