I,O,A

Question 1

I: skin over supraorbital margin (eyebrow skin)
O: Epicranial aponeurosis
A: moves scalp, eyebrows; wrinkles skin of forehead

Answer 1

Frontal belly of occipitofrontalis

Question 2

I: skin surrounding eyelids
O: media, wall or margin of orbit
A: closes eye; produces winking, blinking, squinting (blink muscle)

Answer 2

Orbicularis oculi

Question 3

I: skin at inferior corner (angle) of mouth
O: body of mandible
A: draws corners of mouth inferiorly and laterally

Answer 3

Depresser anguli oris

Question 4

I: skin at superolateral edge of mouth
O: zygomatic bone
A: elevates corner of mouth (smile muscle)

Answer 4

Zygomaticus major

Question 5

I: ramus (lateral surface) and Angle of mandible
O: zygomatic arch
A: elevates and protracts mandible; prime mover of Jaw closure

Answer 5

Masseter

Question 6

I: Mastoid process
O: manubrium and sternal end of clavicle
A: unilateral action: lateral flexion, rotation of head to opposite side. Bilateral action: flexes neck

Answer 6

Sternocieldomastoid

Question 7

I: occipital bone and mastoid process of temporal bone
O: Ligamentum nuchae and spinous processes of c7-t3
A: unilateral action: turns head to same side. Bilateral action: extends head/neck

Answer 7

Splenius capitis

Question 8

A: contraction causes flattening of diaphragm (moves inferiorly), and thus expansion of thoracic cavity; increases pressure in abdominoplevic cavity

Answer 8

Diaphragm

Question 9

I: linea alba by a broad aponeurosis; some to iliac crest
O: external and inferior borders of the inferior 8 ribs
A: unilateral action: lateral flexion of vertebral column; rotation of vertebral column to the opposite side. Bilateral action: flexes vertebral column and compresses abdominal wall; used in forced exhalation

Answer 9

External oblique

Question 10

I: xiphoid process of sternum; inferior surfaces of ribs 5-7
O: superior surface of pubis near symphysis
A: flexes vertebral column; compresses abdominal wall; used in forced exhalation

Answer 10

Rectus abdominis

Question 11

I: clavicle; acromion process and spine of scapula
O: occipital bone (superior nuchal line); ligamentum nuchae; spinous processes of c7-t12
A: superior fibers: elevate and superiorly rotate scapula. Middle fibers: retract scapula. Inferior fibers: depress scapula.

Answer 11

Trapezius

Question 12

I: intertubecular sulcus of humerus
O: spinous processes of t7-t12; ribs 8-12; iliac crest; thoracolumbar fascia
A: agonist of arm extension; also adducts and medially rotates arm (“swimmers muscle”)

Answer 12

Latissimus dorsi

Question 13

I: deltoid tuberosity of humerus
O: acrominal end of clavicle; acromion and spine of scapula
A: anterior fibers: flex and medially rotate arm. Middle fibers: agonist of arm abduction.
Posterior fibers: extend and laterally rotate arm

Answer 13

Deltoid

Question 14

I: lateral part of intertubecular sulcus of humerus
O: medial clavicle; costal cartilages of ribs 2-6; body of sternum
A: agonist of arm flexion; also adducts and medially rotates arm. Also horizontal adduction of arm

Answer 14

Pectoralis major

Question 15

I: radial tuberosity and bicipital aponeurosis
O: long head: supraglenoid tubercle of scapula. short head: coracoid process of scapula
A: flexes forearm, powerful supinator of forearm. Long head flexes arm

Answer 15

Bicep brachii

Question 16

I: lesser trochanter of femur with iliacus
O: transverse processes and bodies of t12-l5 vertebrae
A: flexes thigh

Answer 16

Psoas major

Question 17

I: lesser trochanter of femur with Psoas major
O: iliac fossa
A: flexes thigh

Answer 17

Iliacus

Question 18

I: iliotibial tract of fascia lata; linea apera and gluteal tuberosity of femur
O: iliac crest, sacrum, coccyx
A: extends thigh; laterally rotates thigh

Answer 18

Gluteus maximus

Question 19

I: quadriceps tendon to patella and then patellar ligament to tibial tuberosity
O: anterior inferior iliac spine
A: flexes thigh, extends leg

Answer 19

Rectus femoris

Question 20

I: metatersal: and first (medial) cuneiform
O: lateral condyle and proximal shaft of tibia; interosseous membrane
A: dorsiflexes foot; inverts foot

Answer 20

Tibialis anterior

Question 21

I: calcaneus
O: superior posterior surfaces of lateral and medial condyles of femur
A: flexes leg; plantar flexes foot

Answer 21

Gastrocnemius