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TMJ, Face, Skull. TMJ Mandibular fossa of temporal bone with condyle of mandible Incongruent surfaces Two joint cavities with articular disc interposed.

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Presentation on theme: "TMJ, Face, Skull. TMJ Mandibular fossa of temporal bone with condyle of mandible Incongruent surfaces Two joint cavities with articular disc interposed."— Presentation transcript:

1 TMJ, Face, Skull

2 TMJ Mandibular fossa of temporal bone with condyle of mandible Incongruent surfaces Two joint cavities with articular disc interposed Lower cavity = hinge joint Upper joint = gliding

3 TMJ

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5 Mandible

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7 TMJ Capsule Surrounds the joint Encloses the disc Attaches above the margins of the mandibular fossa To the neck of the mandible Inner aspect of capsule attaches to disc Above disc – capsule loose Below disc - taut

8 TMJ Capsule

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10 TMJ Ligaments Lateral ligament - AKA TMJ ligament From zygomatic bone to run inferiorly and posteriorly to blend with the joint capsule to attach to lateral and posterior parts of the neck of the mandible Sphenomandibular Strong thin flat band lying on medial aspect of the joint Passes inferiorly and forwards from the spine of the sphenoid to the lingula Stylomandibular Extends from the apex of the styloid process to the lower part of the posterior border of the ramus of the mandible, near the angle

11 TMJ Capsule

12 TMJ Innervated by CN V, Mandibular branch Movements Elevation, depression, retraction, protraction, side to side Elevation and depression involves the hinge like rotation of the condyle against the disc in the lower compartment Protraction and retraction – actions whereby the condyle and disc move as one unit against the mandibular fossa. In protraction the condyle and disc glide forwards so that the condyle rides on the articular eminence – retraction = opposite

13 CN V Trigeminal

14 TMJ Motions

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16 TMJ Side to side – grinding movements Mandible is alternately protracted and retracted with the two sides moving in opposite directions so that one side is protracted while the other is retracted Actions combined with elevation and depression, rhythmically and alternately

17 Muscles of Mastication Masseter Temporalis Lateral pterygoid Medial pterygoid All innervated by CNV Opening of jaw (depression) primarily passive or gravity assist

18 Masseter

19 Temporalis

20 Pterygoids

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23 Nerve Supply to Face Sensory by three divisions of CN V – opthalmic, maxillary, mandibular Innervation of muscles of facial carried out by CN VII – the Facial Nerve Origin, branches, motor functions, sensory functions, parasympatheric functions

24 CN V

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26 Sensory to Face

27 Sensory

28 Scalp Three Layers Outer = skin Beneath that – subcutaneous layer with many nerves and vessels running through here, binds skin to inner layer Galea Aponeurotica – AKA epicranial aponeurosis Galea attaches to pericranium via loose CT This allows scalp to move over the skull Most muscles of face attach to skin, this arrangement allows them to be more mobile.

29 Scalp

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31 CN VII – The Facial Nerve Motor nerve to muscles of facial expression with one notable exception Origin = lower pons Branches – common nerve enters face Temporal Zygomatic Buccal Mandibular Cervical

32 Motor to Face CNVII

33 CN VII Motor Functions Muscles of facial expression External ear Sensory functions Ant. 2/3 of tongue Soft palate Pharynx Parasympathetic Gland stimulation

34 CN VII

35 Muscles of Facial Expression Primary action is to act as either a sphincter or dilator of the orifices of the face Facial expression is a by-product Orifices Lips = labia Nose = nares; Nostrils, Septum, Ala, Apex, Root Eyelids = palpebrae External Ear = auricle, lobule = soft portion

36 Selected Muscles of Facial Expression * = learn Orbicularis Oculi Levator Palpebrae Superioris* O: Root of Orbital Cavity I: Skin of upper eyelid A: Raises upper eyelid N: Note Well, Nerve = CN III Ptosis is a condition of denervation to this muscle causing drooping of the eyelid, a clinical symptom indicating more loss

37 Facial MM

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41 Muscles Continued Occipitofrontalis Corrugator Auricular muscles of the ear – ant., post., sup. Nose Nasalis Procerus Depressor Septi

42 Facial MM

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44 Ear MM

45 Nose MM

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47 Muscles Mouth Depressor anguli oris Depressor labii inferior Mentalis Risorius Orbicularis oris Buccinator* Zygomaticus major Zygomaticus minor Levator labii superioris Platysma

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49 Mouth

50 Facial MM

51 Extra Occular Muscles of the Eye Muscles that move the eyeball Innervated by: CN III (most), CN IV (1),CN VI (1) Many have an origin from the annulus tendinous, a common tendon ring attached around the optic canal Most attach to the sclera of the eyeball

52 Eye MM

53 Muscles * Superior Rectus – rotates eyeball upward and medially –CN III Medial Rectus – rotates medially (ADD) – CN III Lateral Rectus – rotates eyeball laterally (ABD) – CN VI Inferior Rectus – rotates eyeball downward and medially – CN III

54 Eye MM

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58 Muscles * Superior Oblique – rotates eyeball downward and lateral – CN IV Inferior Oblique – rotates eyeball upward and lateral – CN III Combined motions Up and medial = sup.rectus Up and lateral = inferior oblique Straight up = sup. rectus and inf. oblique Straight down = inf. rectus and sup. oblique Down and medial = inferior rectus Down and lateral = superior oblique Lateral Gaze = ABD of one eye with ADD of the other

59 Eye Movements

60 Eye Movments

61 Eye Movements


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