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23 terms

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
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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)