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Skeletal Muscles- Gross Anatomy & Functions
Muscle & Function of: -Muscles of Facial Expression -Muscles of Mastication -Anterior Muscles of the Neck -Muscles of the Vertebral Column -Oblique & Rectus Muscle Groups
Lines mouth (oral cavity)
Function: compresses cheeks (to whistle; kiss)
Function: Protrudes/elevates lower lip (pouty)
compresses, purses lips
From zygomatic arch to corner of lips.
Function: Draws angles of the mouth upward and outward; major muscle used in smiling and laughing
Circle around eyes.
Function: Closes eyelids; used in blinking, winking, and squinting
Tightens scalp. Occipitalis & Frontalis.
Frontal belly (Portion)
raises skin on forehead ; raises eyebrows
tenses and retracts scalp
either of two broad muscles located on either side of the neck and innervated by the facial nerve. Tightens skin.
a large muscle that raises the lower jaw.
Function: used in chewing
muscle extending from the temporal fossa to the coronoid process of the mandible.
Function: Close jaw
one of two thick muscles running from the sternum and clavicle to the mastoid and occipital bone.
Function: Flex head; rotate; bend sideways.
extends vertebral column
(3 muscle groups listed below)
extends vertebral column.
Attached to spine.
(General Group) Alongside spine
(General group) extends neck and vertebral column; maintains posture
Elevates the rib cage (outside)
Draws the ribs together and depresses rib cage. (Inside)
origin is lower 8 ribs, compresses abdomen; most external of abdominal muscles
compresses abdomen, middle layer; fibers point up to the head
a flat muscle with transverse fibers that forms the anterior and lateral walls of the abdominal cavity. (Across, inside)
muscular partition that separates the thoracic cavity from the abdominal cavity and aids in respiration by moving up and down. (Inspiration & experation)
Compresses abdominal cavity and flexes vertebral column. (down middle of abdomin)