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BOB TOPIC 4 - Angeline Ardythe Katarina Rajagukguk - 2506553534 - Coggle…
BOB TOPIC 4 - Angeline Ardythe Katarina Rajagukguk - 2506553534
Boundaries of OCF (scalp + face) & bones involved
Scalp (SCALP layers)
Skin
Connective tissue
Aponeurosis
Loose connective tissue
Pericranium
Facial area bones
Frontal, zygomatic, maxilla, mandible, nasal, lacrimal
Definition & function of skeletal muscles
Definition
Voluntary, striated muscle attached to bones
Functions
Movement of body parts
Maintain posture
Stabilize joints
Produce facial expression
Support and protect soft tissues
Six characteristics used in naming muscles
Shape (ex: orbicularis, buccinator)
Size (major, minor)
Fiber direction (oblique, rectus)
Location (frontalis, temporalis)
Number of origins (biceps, triceps)
Function (levator, depressor)
Classification & anatomy of OCF facial expression muscles
Orbital group → orbicularis oculi, corrugator
Nasal group → procerus, nasalis
Oral group → orbicularis oris, buccinator, zygomaticus major/minor, levator labii, depressors, mentalis, risorius
Auricular group → auricular muscles
Origin–Insertion examples
Levator anguli oris → maxilla → mouth angle
Depressor anguli oris → mandible → mouth angle
Buccinator → alveolar processes + raphe → modiolus
Orbicularis oris → maxilla/mandible/modiolus → lips
Functions
Move skin for expressions (smile, frown, puffing, closing eyes/mouth)
Definition & anatomical structure of TMJ
Synovial joint between mandible + temporal bone
Components
Mandibular condyle
Mandibular fossa
Articular tubercle
Articular disc
Joint capsule
Ligaments (TMJ, stylomandibular, sphenomandibular)
TMJ component that is the center of secondary growth
Mandibular condyle
Growth site with secondary cartilage
Controls vertical ramus development
Topography, macro/micro structure, function of TMJ components
Condyle → secondary cartilage, growth center
Fossa + articular eminence → gliding surface
Disc
Dense fibrocartilage
Biconcave shape
Divides joint into upper (gliding) + lower (hinge) compartments
Capsule → encloses joint
Ligaments → limit movement, stabilize
Functions
Rotation (opening)
Translation (protrusion, wide opening)
Anatomy of masticatory muscles (O = Origin, I=Insertation, F=Function)
Temporalis
O: temporal fossa
I: coronoid process
F: elevate + retract
Medial pterygoid
O: pterygoid fossa
I: medial mandibular ramus
F: elevate + assist protrusion
Masseter
O: zygomatic arch
I: mandibular angle/ramus
F: elevate mandible
Lateral pterygoid
O: sphenoid
I: condyle + disc
F: protrusion + opening
Classification & anatomy of neck muscles (O = Origin, I=Insertation, F=Function)
Superficial → platysma
Sternocleidomastoid
O: sternum + clavicle
I: mastoid
F: rotate/tilt head
Suprahyoid → digastric, mylohyoid (assist mandible depression)
Infrahyoid → sternohyoid, sternothyroid
Function → swallowing, speech, posture, assist jaw movement