dr. ahmed fathalla ibrahim. facial infection dangerous area of face 1.a triangular area bounded with...
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FACIAL INFECTION
• DANGEROUS AREA OF FACE1. A triangular area bounded with an apex opposite
the medial angles of eyes & nose and a base formed by the upper lip
2. It is drained by facial vein3. It has important communications with cavernous
sinus:
supraorbital & superior ophthalmic veins
Facial vein Cavernous sinus
deep facial vein pterygoid plexus of veins emmissary veins
FACIAL INFECTION
• DANGEROUS AREA OF FACE
• Infection of this area may lead to:
1. Thrombosis of facial vein
2. Infection may be transmitted to cavernous sinus leading to cavernous sinus thrombosis
TRIGEMINAL NERVE
• Supplies the skin of the face EXCEPTEXCEPT the area over the angle of mandible & parotid gland
• Is represented by 3 divisions:
1. Ophthalmic
2. Maxillary
3. Mandibular
TRIGEMINAL NERVE
• OPHTHALMIC:1. Supratrochlear:
forehead + medial part of upper eyelid
2. Supraorbital: same3. Palpebral branch of
lacrimal: lateral part of upper eyelid
4. Infratrochlear: upper part of nose
5. External nasal: lower part of nose
TRIGEMINAL NERVE
• MAXILLARY:
1. Infraorbital: divides into: a) palpebral for lower eyelid, b) nasal for ala of nose, c) labial for upper lip
2. Zygomaticofacial: upper part of cheek
TRIGEMINAL NEURALGIA
• Inflammatory condition affecting one or more of the three divisions of trigeminal nerve
• Gives rise to severe pain in the area of distribution of the affected nerve
• Surgical treatment may involve:
1. Alcohol injection of the trigeminal ganglion
2. Section of the central root of the nerve or of the appropriate division
FACIAL NERVE• Extracranial course:Extracranial course:1. The nerve leaves the cranial cavity through stylomastoid stylomastoid
foramenforamen2. The nerve enters the parotid gland & divides into 5 terminal 5 terminal
motor branchesmotor branches that emerge from the gland• Extracranial distribution:Extracranial distribution:• After emergence from stylomastoid foramen:After emergence from stylomastoid foramen:1.1. Posterior auricular:Posterior auricular: to occipital belly of occipitofrontalis muscle2.2. Muscular branchMuscular branch to posterior belly of digastric3.3. Muscular branchMuscular branch to stylohyoid• After emergence from parotid gland:After emergence from parotid gland:1.1. Temporal:Temporal: to orbicularis oculi, frontal belly of occipitofrontalis
muscles2.2. Zygomatic:Zygomatic: to orbicularis oculi muscle3.3. Buccal:Buccal: to buccinator, muscles of upper lip & nose4.4. Mandibular:Mandibular: to muscles of lower lip5.5. Cervical:Cervical: to platysma
FACIAL NERVE INJURY
• UPPER MOTOR NEURONE LESION (SUPRANUCLEAR LESION): e.g. lesion in pyramidal tracts: paralysis of muscles on the lower quadrant of face opposite to the side of lesion (the patient can close his eye but cannot expose his teeth on the affected side)
• LOWER MOTOR NEURONE LESION (NUCLEAR OR INFRANUCLEAR LESION): e.g. Bell’s palsy: paralysis of all muscles of face on same side of lesion (the patient cannot close his eye and cannot expose his teeth on the affected side)
FACIAL ARTERY
• ORIGIN: A branch of external carotid in the neck• COURSE IN FACE:1. Curves around the lower border of mandible (pulse
can be felt)2. Ascends: lateral to lips & nose,
anterior to facial vein3. Runs a tortuous course• TERMINATION: at the medial angle of eye, where it
anastomoses with branches of ophthalmic artery• BRANCHES IN FACE:1.1. Inferior labial Inferior labial 2.2. Superior labialSuperior labial3.3. Lateral nasalLateral nasal
SUPERFICIAL TEMPORAL ARTERY
• ORIGIN: One of the 2 terminal branches of external carotid artery in the parotid gland
• COURSE: 1. Ascends in front of auricle (pulse can be felt)2. Accompanies the auriculotemporal nerve• BRANCHES:1.1. Transverse facial:Transverse facial: arises inside the parotid
gland & runs transversally above parotid duct
2.2. anterior & posterior branches:anterior & posterior branches: supply the scalp