1 Muscle ID Head & Neck

Muscle flashcards for BIOL&241 practical exam

Occipitofrontalis frontal belly

Action: Elevates eyebrows

Attachments: Posteriorly: Galea aponeurotica; Anteriorly: Subcutaneous tissue of eyebrows

Innervation: Facial nerve (CNVII)

Occipitofrontalis occipital belly

Action: Retracts scalp

Attachments: Anteriorly: Galea aponeurotic; Posteriorly: Occipital and temporal bones

Innervation: Facial nerve (CN VII)

Orbicularis Oculi

Action: closes eye

Innervation: Facial nerve (CN VII)

Orbicularis Oris

Action: Closes lips

Innervation: Facial nerve (CN VII)

Temporalis

Action: Chewing

Attachments: Superiorly: Temporal bone; Inferiorly: Mandible

Innervation: Trigeminal nerve (CN V)

Masseter

Action: Chewing

Attachments: Superiorly: Zygomatic arch; Inferiorly: Mandible

Innervation: Trigeminal nerve (CN V)

Sternocleidomastoid

Action: Lateral flexion and cervical rotation; draws head forward and down

Attachments: Superiorly: Mastoid process of the temporal bone; Inferiorly: Manubrium of the sternum, medial clavicle

Innervation: Accessory nerve (CN XI)

Trapezius

Action: Upper - Elevates scapula; Middle - Retracts scapula; Lower - Depresses scapula

Attachments: Proximally: Occipital bone, spinous processes of C7 - T12 vertebrae; Distally: acromion and spine of scapula, lateral third of clavicle

Innervation: Accessory nerve (CN XI)