Skeletal Muscles- Gross Anatomy & Functions

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Muscle & Function of: -Muscles of Facial Expression -Muscles of Mastication -Anterior Muscles of the Neck -Muscles of the Vertebral Column -Oblique & Rectus Muscle Groups

Buccinator

Lines mouth (oral cavity)
Function: compresses cheeks (to whistle; kiss)

Mentalis

Chin.
Function: Protrudes/elevates lower lip (pouty)

Orbicularis Oris

compresses, purses lips

Zygomaticus Major

From zygomatic arch to corner of lips.
Function: Draws angles of the mouth upward and outward; major muscle used in smiling and laughing

orbicularis oculi

Circle around eyes.
Function: Closes eyelids; used in blinking, winking, and squinting

Occipitofrontalis (Epicranium)

Tightens scalp. Occipitalis & Frontalis.

Frontal belly (Portion)

raises skin on forehead ; raises eyebrows

Occipital belly

tenses and retracts scalp

Platysma

either of two broad muscles located on either side of the neck and innervated by the facial nerve. Tightens skin.

Masseter

a large muscle that raises the lower jaw.
Function: used in chewing

Temporalis

muscle extending from the temporal fossa to the coronoid process of the mandible.
Function: Close jaw

Sternocleidomastoid

one of two thick muscles running from the sternum and clavicle to the mastoid and occipital bone.
Function: Flex head; rotate; bend sideways.

erector spinae

extends vertebral column
(3 muscle groups listed below)

Spinalis Thoracis

extends vertebral column.
Attached to spine.

Longissimus

(General Group) Alongside spine

Iliocostalis

(General group) extends neck and vertebral column; maintains posture

External Intercostals

Elevates the rib cage (outside)

Internal Intercostals

Draws the ribs together and depresses rib cage. (Inside)

External Oblique

origin is lower 8 ribs, compresses abdomen; most external of abdominal muscles

Internal Oblique

compresses abdomen, middle layer; fibers point up to the head

transversus Abdominis

a flat muscle with transverse fibers that forms the anterior and lateral walls of the abdominal cavity. (Across, inside)

Diaphragm

muscular partition that separates the thoracic cavity from the abdominal cavity and aids in respiration by moving up and down. (Inspiration & experation)

Rectus Abdominis

Compresses abdominal cavity and flexes vertebral column. (down middle of abdomin)

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