MUSCLES- BIOL3200 PITTMAN EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS GRADED A++

MUSCLES- BIOL3200 PITTMAN EXAM QUESTIONS AND

ANSWERS WITH COMPLETE SOLUTIONS GRADED A++


Epicranius

Composed of frontalis and occipitalis

Frontalis

Origin: epicranial aponeurosis

Insertion: skin of eyebrows and nose

Action: Raise eyebrows, wrinkle forehead

Occipitalis

Origin: occipital bone

Insertion: epicranial aponeurosis

Action: tense and pull scalp posteriorly

Masseter

Origin: zygomatic arch

Insertion: ramus of mandible

Action: elevate mandible

Orbicularis oculi

Origin: Frontal and maxilla bones

Insertion: Eyelid

Action: Close eyes

Orbicularis oris

, Origin: Maxilla and mandible

Insertion: muscles and skin at corners of mouth

Action: Close and purse lips

Temporalis

Origin: Parietal and frontal bones

Insertion: Coronoid process of mandible

Action: elevate mandible

Zygomaticus

Origin: zygomatic bone

Insertion: muscles and skin at corners of mouth

Action: raise lateral corners of mouth

Platysma

Origin: Fascia of thorax

Insertion: mandible, skin and muscle of cheek

Action: tense skin of neck, depress mandible

Sternohyoid

Origin: Clavicle and manubrium

Insertion: Hyoid bone

Action: Depress hyoid and larynx

Sternocleidomastoid

Origin: Clavicle and manubrium

Insertion: mastoid process