Muscles of Head, Neck, and Trunk Flashcards
What is the epicranial aponeuosis
it is the tendon that connects the frontalis to the occipitalis
Function: Frontal belly
elevate eyebrows and wrinkles forehead skin
Function: Occipital belly
Retracts scalp slightly
Function: Orbicularis Occuli
close eye
Function: Orbicularis Oris
closes and purses lips
Function: Zygomatic major
elevates corner of mouth
Function: depressor angulioris
depresses corner of mouth
Function: Buccinator
pulls cheeks against teeth when chewing
Function: Platysma
tenses the skin of neck and depresses lower lip
Function: Masseter
elevates and protracts mandible
Function: Temporalis
elevates and retracts mandible
Function: medial pteryoid
elevates and protracts mandible
moves mandible side to side
Function: Lateral pterygoid
elevates and protracts mandible
moves mandible side to side
Function: genioglossus
protracts(proturdes) tongue
Function: Styloglosses
elevates and retracts tongue
Function: hyoglossus
depresses and retracts tongue
Function: sternocleidomastoid
rotates head side to side
together: flex the head/neck
Function: Splenius Capitis
rotates head side to side
together: extend the head/neck
Function: Digastric
elevates hyoid
depresses mandible
Function: Stylohyoid
elevates hyoid bone
Function: Mylohyoid
elevates hyoid bone
raises floor of mouth
Function: Sternohyoid
depresses hyoid bone
Function: Omohyoid
Depresses hyoid bone
Function: Sternothyroid
Depresses thyroid cartilage
Function: Thyrohyoid
depresses hyoid bone
raises thyroid cartilage
Function: Quadratus Lumborum
together: extend lumbar vert. column
unilaterally: laterally flex vert. column
where is the quadratus lumborum
iliac crest to the vert. column
Function: Erector Spinae
extend vert. column
Iliocostalis
most lateral erector spinae
Longissimus
intermediate erector spinae
Spinalis
most medial erector spinae
Function: Diaphragm
contraction pulls the central portion down
increases vertical dimensions of the thorax
Function: External Intercostals
elevates the rib cage on inhalation
Function: Internal Intercostals
depresses ribs during forced exhalation