muscles of the head, neck, and trunk
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53 Terms
What is the action of the buccinator muscle?
compresses cheek (ex. whistling)
What is the innervation of the buccinator muscle?
facial nerve
What is the action of the depressor anguli oris muscle?
lowers corner of mouth
What is the innervation of the depressor anguli oris muscle?
facial nerve
What is the action of the depressor labii inferioris muscle?
protrudes lower lip
What is the innervation of the depressor labii inferioris muscle?
facial nerve
What is the action of the frontalis muscle?
raises eyebrows
What is the origin of the frontalis muscle?
epicranial aponeurosis
What is the insertion of the frontalis muscle?
skin of eyebrows
What is the innervation of the frontalis muscle?
facial nerve
What is the action of the levator labii superioris muscle?
elevates upper lip
What is the innervation of the levator labii superioris muscle?
facial nerve
What is the action of the mentalis muscle?
protrudes lower lip and chin
What is the innervation of the mentalis muscle?
facial nerve
What is the action of the occipitalis muscle?
pulls scalp posteriorly
What is the origin of the occipitalis muscle?
occipital bone
What is the insertion of the occipitalis muscle?
epicranial aponeurosis
What is the innervation of the occipitalis muscle?
facial nerve
What is the action of the orbicularis oculi muscle?
closes eye
What is the innervation of the orbicularis oculi muscle?
facial nerve
What is the action of the orbicularis oris muscle?
closes lips
What is the innervation of the orbicularis oris muscle?
facial nerve
What is the action of the platysma muscle?
depresses mandible
What is the innervation of the platysma muscle?
facial nerve
What is the action of the risorius muscle?
pulls mouth laterally
What is the innervation of the risorius muscle?
facial nerve
What is the action of the zygomaticus major muscle?
raises upper lip laterally
What is the origin of the zygomaticus major muscle?
zygomatic bone
What is the innervation of the zygomaticus major muscle?
facial nerve
What is the action of the zygomaticus minor muscle?
raises upper lip laterally
What is the origin of the zygomaticus minor muscle?
zygomatic bone
What is the innervation of the zygomaticus minor muscle?
facial nerve
What is the action of the masseter muscle?
elevates mandible
What is the origin of the masseter muscle?
zygomatic arch
What is the insertion of the masseter muscle?
mandible
What is the action of the temporalis muscle?
elevates mandible
What is the origin of the temporalis muscle?
lateral surface of skull
What is the insertion of the temporalis muscle?
mandible
What is the action of the digastric muscle?
depresses mandible
What is the origin of the digastric muscle?
temporal bone (mastoid process)
What is the insertion of the digastric muscle?
hyoid
What is the action of the infrahyoid group muscle?
depresses hyoid bone and larynx
What is the action of the suprahyoid group muscle?
elevates hyoid and floor of mouth for swallowing
What is the action of the scalenes muscle?
unilateral: lateral flexion
What is the origin of the scalenes muscle?
cervical vertebrae
What is the insertion of the scalenes muscle?
ribs (1 & 2)
What is the action of the semispinalis capitis muscle?
neck extension
What is the action of the splenius capitis muscle?
bilateral: neck extension, unilateral: rotate head to same side
What is the action of the sternocleidomastoid muscle?
bilateral: flex head, unilateral: rotation of head towards opposite side
What is the origin of the sternocleidomastoid muscle?
sternum, clavicle
What is the insertion of the sternocleidomastoid muscle?
temporal bone (mastoid process)
What is the action of the trapezius muscle?
neck extension
What is the action of the spinalis, longissimus, iliocostalis muscle?
extend the vertebral column, more lateral muscles laterally bend the vertebral column