Anatomy theme 3 Flashcards
Where does the facial nerve leave the Skull ?
Stylomastoid Foramen
Where does the facial nerve go after leaving the skull ?
enters the parotid gland
What are the 5 branches of the facial nerve and what do they do ?
motor to the muscles of facial expression and some suprahyoid muscles Temporal Zygomatic Buccal Mandibular Cervical
What are common features of the Muscles of facial expression ?
All innervated by the facial nerve
common embryological origin - 2nd Pharyngeal arch
originate from bine and insert into the skin
What do the muscles of facial expression act as ?
sphinctors and dliators
round the facial orifices
What are the 3 parts of Obicularis Oculi ?
orbital part
Palperabal Part
Lacrimal Part
What is the origin and insertion of the Orbital part ?
originates from the medial orbital margin
Inserts into the skin around the orbit
What is the origin and insertion of the Palperabal part >
Originates from the Medial palperabal ligament and inserts into the eyelids
What is the origin and insertion of the lacrimal part ?
originates from the lacrimal bone
inserts into the medial aspect of the eye lids
What is the innervation of Obicularis Oculi ?
Facial nerve - T and Z branches
What is the action of the orbital part ?
forcefully closes the eyelids
What is the action of the palperabal part ?
gently closes the eyelids
What is the role of the lacrimal part ?
tears
What is the role of obicularis oculi ?
it is a sphincter that controls the opening and closing of the orbital orifice
What is the origin and insertion of Procerus ?
originates from the fascia over the dorsum of the nose
inserts into the skin over the Glabella
What is the innervation of Procerus ?
facial nerve - T andZ branches
What is the action of procerus ?
contraction produces wrinkling over the bridge of the nose
What is the origin and insertion of Frontalis ?
Originates from the aponeurosis of the scalp
Inserts into the skin over the eyebrow
What is the innervation of Frontalis ?
Facial nerve - Temporal branch
What is the action of Frontalis ?
contraction produces wrinkling over the brow
What is the innervation of mentalis ?
Facial nerve - Mandibular branch
What is the action of Mentalis ?
protrudes the lip
puckers the skin of the chin
What is the innervation of the Compressor Naris ?
Facial Nerve - Zygomatic and Buccal branches
What is the innervation of the Dilator Naris ?
Facial Nerve - Zygomatic and Buccal branches
What is the origin and insertion of Depressor Septi ?
arises from thhe incisive fossa of the maxilla and inserts into the nasal septum
What is the innervation of depressor septi ?
Facial nerve - buccal branch
What is the action of depressor septi ?
move the apex of the nose
What is the origin and insertion of Obicularis Oris ?
arises from the incisive fossa of the maxilla and the mandible
inserts into the skin around the lip
What is the innervation of Obicularis Oris ?
Facial nerve - zygomatic buccal and mandubular branches
What is the action of orbicularis oris ?
sphincter
presses the lips against the teeth
protrudes the lips
What is the innervation of Levator Anguli Oris ?
Facial nerve - Zygomatic and Buccal branches
What is the action of levator anguli oris ?
it lifts the angle of the mouth
What is the innervation of depressor anguli oris ?
facial nerve - buccal and mandibular branches
What is the action of depressor anguli oris ?
pull the angle of the mouth downwards
What is the innervation of of Zygomaticus Major ?
Facial nerve - Zygomatic and buccal branches
What is the action of zygomaticus major ?
it draws the angle of the mouth upwards and backwards
What is the innervation of Zygomaticus minor ?
Facial nerve - Zygomatic and buccal branches
What is the action of Zygomaticus minor ?
raises the upper lip
What is the function of levator labii superioris ?
it elevates the upper lip
alaeque nasi flares the nostril
What is the origin and insertion of Depressor Labii inferioris ?
originates from the oblique line of the mandible
Inserts into the lower lip
What is the innervation of depressor labii inferioris ?
Facial nerve - Mandibular