Human muscles ( Head, Neck, Face)

Epicranius : two part muscles of the scalp

1) frontal belly: O: epicranial aponeurosis I: skin of eyebrows and root of nose A: raise the eyebrows

2) occipital belly: O: occipital and temporal bones I: epicranial aponeurosis A: fixes aponeurosis and pulls scalp posteriorly

Epicranial aponeurosis (CT) connects the occipital with the frontal

Muscles of eyes

Orbicularis oculi ( circular eyes)

O: frontal and maxillary bones and ligaments around orbit

I: tissue of eyelid

A: closes eyes

Muscles of the mouth

1) Zygomaticus: O: zygomatic bone .I: skin and muscle at corner of mouth. A: smiling

2) Risorius :O: lateral fascia associated w/ masseter muscle. I : skin at angle of mouth. A: tenses lips ( synergist of zygomaticus)

3) orbicularis oris : O:facial muscles associated with lips. I : encircles mouth .A : closes lips

Muscles of mastication

1)Masseter( chewer): O: zygomatic arch and zygomatic bone. I : angle and ramus of mandible. A: primer mover of jaw closure

2) Temporalis: O: temporal fossa .I : coronoid process of mandible. A: closes jaw

Muscles of neck / throat

Digastric: O: lower mandible and mastoid process of temporal bone. I : by CT loop to hyoid bone. A : open mouth. Synergist

Sternocleidomastiod : O: sternum and clavicle. I: mastoid process of temporal bone and occipital bone. A: flexes and rotates head