Axial Muscles Flashcards

Muscle:
Frontalis (Frontal Belly of Occipitofrontalis)
Action:
Elevates eyebrow
Notes:
Is part of “epicranius”

Muscle:
Orbicularis Oculi
Action:
Closes eye
Notes:
Blinking/squinting

Muscle:
Orbicularis Oris
Action:
Compresses lips
Notes:
“kissing muscle”

Muscle:
Zygomaticus Major
Action:
Elevates corner of mouth
Notes:
“Smile muscle”

Muscle:
Depressor Anguli Oris
Action:
Draws corner of mouth inferiorly
Notes:
“Frown muscle”

Muscle:
Procerus
Action:
Moves and wrinkles nose
Notes:

Muscle:
Masseter
Action:
Elevates mandible
Notes:
Prime mover of jaw closure

Muscle:
Temporalis
Action:
Elevates mandible
Notes:

Muscle:
Buccinator
Action:
Compresses cheek
Notes:
Holds food between teeth when chewing.

Muscle:
Mentalis
Action:
Protrudes lower lip/wrinkles chin
Notes:
“Pout muscle”

Muscle:
Anterior Belly - Digastric
Action:
Depresses mandible
Notes:
Suprahyoid muscle

Muscle:
Posterior Belly - Digastric
Action:
Elevates hyoid
Notes:
Suprahyoid muscle

Muscle:
Mylohyoid
Action:
Elevates hyoid
Notes:
Suprahyoid muscle

Muscle:
Omohyoid
Action:
Depresses hyoid
Notes:
Infrahyoid muscle
Muscle:
Sternohyoid
Action:
Depresses hyoid
Notes:
Infrahyoid muscle

Muscle:
Sternocleidomastoid
Action:
Flexes neck (bilateral)
Notes:
Unilateral contraction flexes neck & rotates head to opposite side

Muscle:
Scalenes
Action:
Flexes neck, elevate ribs
Notes:

Muscle:
Splenius Capitis
Action:
Extends neck
Notes:
Unilateral contraction turns head to same side.

Muscle:
Semispinalis Capitis
Action:
Extends neck
Notes:

Muscle:
Spinalis (Erector Spinae)
Action:
Extends vertebral column
Notes:

Muscle:
Longissimus (Erector Spinae)
Action:
Extends vertebral column
Notes:

Muscle:
Iliocostalis (Erector spinae)
Action:
Extends vertebral column
Notes:

Muscle:
Quadratus Lumborum
Action:
Extends vertebral column
Notes:
Unilateral contraction flexes vertebral column laterally.

Muscle:
Multifidus
Action:
Extension and contralateral rotation of spine
Notes:
Major intrinsic stabilizer of vertebral column

Muscle:
External Intercostals
Action:
Elevates ribs
Notes:
Increase transverse dimension of thoracic wall

Muscle:
Internal Intercostals
Action:
Depress ribs
Notes:
Involved in forced expiration

Muscle:
Diaphragm
Action:
Expands thoracic cavity (inspiration)
Notes:
Also compresses abdominal viscera

Muscle:
External Abdominal Oblique
Action:
Flexes and rotates (contralateral) vertebral column
Notes:
Also compresses abdominal wall; unilateral contraction can also flex vertebral column laterally.

Muscle:
Internal Abdominal Oblique
Action:
Flexes and rotates (ipsilateral) vertebral column
Notes:
Also compresses abdominal wall; unilateral contraction can also flex vertebral column laterally.

Muscle:
Rectus Abdominis
Action:
Flexes vertebral column and rotates pelvis
Notes:
Also compresses abdominal wall; partitioned by tendinous intersections and linea alba.

Muscle:
Transversus Abdominis
Action:
Retracts abdominal wall and flexes vertebral column.
Notes:
Plays a major role in intrinsic spinal stability