Muscles of the Scalp Flashcards
What is the origin of the Occipitalis ?
superior nuchal line of the occipital bone and the mastoid process of the temporal bone
What is the insertion of the occipitalis?
galea aponeruotica
What nerve innervates the occipitalis?
Facial (CNVII)
What is the origin of the Frontalis?
Galea Aponeruotica
What is the insertion of the Frontalis?
Fascia and skin superior to the eye and nose
What nerve innervates the frontalis?
Facial (CNVII)
What are the actions of the occipitofrontalis?
raising the eyebrows
draws scalp posteriorly or anteriorly
What is the origin of the masseter?
zygomatic arch
What is the insertion of the masseter
angle and ramus of the mandible
What are the actions of the masseter
elevation of mandible @ TMJ
protraction of mandible @ TMJ
What nerve innervates the masseter
trigeminal nerve (CNV)
What is the origin of the temporalis
temporal fossa
What is the insertion of the temporalis
coronoid process and anterior border of ramus of the mandible
What are the actions of the temporalis
elevates the mandible @ tmj
retracts the mandible @ TMJ
What is the origin of the zygomatiucus major
zygomatic bone
What is the insertion of the zygomaticus major
angle of the the mouth
What are the actions of the zygomaticus major
elevates the angle of the mouth
What is the origin of the risorius
fascia over the parotid gland
What is the insertion of the risorius
angle of the mouth
What are the actions of the risorius
draws laterally the angle of the mouth
what nerve innervates the risorius
Facial nerce (CNVII)
What nerve innervates the zygomaticus major
Facial nerve CNVII
What is the origin of the buccinator
maxilla and mandible (alveolar processes)
What is the insertion of the buccinator
lips
What are the actions of the buccinator
compresses the cheeks
What nerve innervates the buccinator
facial nerve CNVII
What is the origin of the platysma
subcutaneous fascia of the superior chest
What is the insertion of the platysma
mandible and the subcutaneous fascia of the lower face
What are the actions of the platysma
draws the skin of the superior chest and neck creating ridges of skin in the neck
depresses and pulls lower lip laterally
What nerve innervates the platysma
facial nerce CNVII
What is the origin of the SCM
manubrium of the sternum and medial 1/3 of clavicle
What is the insertion of the SCM
mastoid process of temporal bone and lateral 1/2 of the superior nuchal line of occipital bone
What are the actions of the SCM
Lat flex of neck @ spinal joints Lat flex of head @atlantooccipital contralateral rotation of head @ atlantoaxial contralateral rotation of neck @ spinal flex of neck @ spinal Ex of neck @ spinal ex of head @ atlantooccipital elevation of sternum and clavicle during forced inhalation
What nerve innervates the SCM
spinal accessory nerve CNXI
