ORAL CAVITY PPT

May 24, 2012 | By | Reply More

ORAL CAVITY PPT

Dental power point online

ORAL CAVITY

WHY IS HEAD & NECK COMPLICATED?

SPECIAL SENSES (SSA – VISION, AUDITORY SVA – OLFACTION) SURROUND

ORAL CAVITY; YOU SENSE WHAT YOU EAT (AND AVOID BEING EATEN)

OUTLINE: ORAL CAVITY

I. SUBMANDIBULAR REGION

II. TONGUE

III. NERVES, ARTERIES, SALIVARY GLANDS

viewer ORAL CAVITY PPT

I. SUBMANDIBULAR REGION = AREA BETWEEN MANDIBLE & HYOID BONE

REVIEW MUSCLES

1. DIGASTRIC- O – POST. BELLY- TEMPORAL BONE- MASTOID NOTCH; ANT. BELLY- INNER SIDE MANDIBLE;
I – INTERMEDIATE TENDON- HYOID; ACT – ELEVATE HYOID & DEPRESS MANDIBLE INN – V3, VII

2. MYLOHYOID- O – MYLOHYOID LINE OF MANDIBLE;
I – HYOID & MIDLINE RAPHE WITH OPPOSITE SIDE; A – ELEVATE HYOID, RAISES FLOOR OF MOUTH IN SWALLOWING; INN – V3

3. GENIOHYOID – O – inner side of mandible above mylohyoid
A – Elevates hyoid and draws forward Inn – C1 branch hitch-hiking with Hypoglossal nerve (CN XII)

II. TONGUE

MOBILE MUSCULAR ORGAN ATTACHED TO HYOID, MANDIBLE & SKULL BY MUSCLES

FUNCTIONS: SPEECH, SWALLOWING, TASTE & INFANTILE EMOTIONAL EXPRESSIONS

A. SUPERFICIAL STRUCTURES

1. SULCUS TERMINALIS – V- SHAPE GROOVE DIVIDES TONGUE INTO: ANT. 2/3- ORAL PART – GSA; POST 1/3 – PHARYNGEAL PART – GVA

2. FORAMEN CAECUM – PIT IN MIDDLE OF SULCUS TERMINALIS- SITE OF INVAGINATION OF THYROID GLAND

3. LINGUAL FRENULUM (L. BRIDLE) MIDLINE FOLD FROM FLOOR OF MOUTH

4. FIMBRIATED FOLDS (PLICA FIMBRIATA) ( L. FRINGE) – LATERAL TO LINGUAL FRENULUM, LOCATION OF LINGUAL VEINS

5. SUBLINGUAL FOLDS (PLICA SUBLINGUALIS) OVERLIE & HAVE OPENINGS FOR SUBLINGUAL SALIV GLANDS

B. MUSCLES OF TONGUE – all innervated by XII

1. EXTRINSIC MUSCLES – ATTACH TONGUE TO BONES

A) GENIOGLOSSUS
O – GENIAL TUBERCLE OF MANDIBLE
I – TONGUE TO ITS DORSAL SURFACE
A – PROTRUDE

1. EXTRINSIC MUSCLES – ATTACH TONGUE TO BONES

C) STYLOGLOSSUS -

O-STYLOID PROCESS OF
TEMP. BONE
I – LAT. SIDE OF TONGUE
A – DRAWS TONGUE SUPERIORLY & POSTERIORLY

B) HYOGLOSSUS -
O – GREATER & LESSER HORNS OF HYOID BONE
I – LAT. SIDE OF TONGUE
A – DEPRESS

2. INTRINSIC MUSCLES OF TONGUE

A) VERTICAL M. – FIBERS SUP & INF – FLATTEN & BROADEN TONGUE

B) TRANSVERSE M. – FIBERS HORIZONTAL – NARROW TONGUE

C) LONGITUDINAL M. – FIBERS ANT- POST. – SHORTEN TONGUE

III. NERVES, ARTERIES AND SALIVARY GLANDS

1. LINGUAL NERVE

ARISES FROM POST. DIVISION OF V3 IN INFRATEMPORAL FOSSA – COURSES MEDIAL TO MANDIBLE – JOINED BY CHORDA TYMPANI

CHORDA TYMPANI- ARISES FROM VII IN FACIAL CANAL- PASSES THROUGH TYMPANIC CAVITY, MEDIAL TO MALLEUS – OUT VIA PETROTYMPANIC FISSURE – CARRIES SVA TASTE TO ANT 2/3 TONGUE, GVE PARASYMP. TO SUBMANDIBULAR GANGLION

2. GLOSSOPHARYNGEAL NERVE

IX – COMES OUT JUGULAR FORAMEN – COURSES LATERAL TO AND AROUND STYLOPHARYNGEUS MUSCLE

3. HYPOGLOSSAL NERVE

OUT HYPOGLOSSAL CANAL; PASSES BETWEEN INT JUGULAR VEIN AND CAROTID ARTERIES; RECEIVES C1 FIBERS (ANSA CERVICALIS) TO THYROHYOID & GENIOHYOID

 

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Category: Dental

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