Scalp face and lacrimal apparatus Dr ASHWINI SHETTY

Scalp, face and lacrimal apparatus Dr. ASHWINI SHETTY

Scalp Soft tissue covering the cranial vault n It is hair bearing area of the skull n Extend from supra orbital margin anteriorly to external occipital protuberance & superior nuchal line posteriorly n On each side to superior temporal line n

SCALP S-Skin n C-connective tissue (superficial fascia) n A-aponeurosis (galea aponeurotica) n L-loose areolar tissue n P-pericranium n

Skin Thick and hairy n Firmly attached to the epicranial aponeurosis through dense fascia n Abundance sebaceous glands n Sebaceous cyst are common n

Connective tissue n n n Fibrous and dense containing blood vessels and nerves Binds skin to subjacent aponeurosis Wounds bleed profusely as blood vessels are prevented from retraction by fibrous tissue. Bleeding is stopped by applying pressure against the bone Subcutaneous hemorrhage are not extensive since fascia is dense Inflammation cause little swelling but are much painful

Aponeurosis n n Anteriorly frontal belly and posteriorly occipital belly of occipitofrontalis muscle Frontal belly originate from skin of forehead and mingled with orbicularis oculi muscle Occipital belly originate from lateral 2/3 of superior nuchal line It gaps if cut transversely and should be stitched

Loose areolar tissue n n n n Extends anteriorly into the eyelids because frontalis has no bony attachment Posteriorly to superior nuchal line On each side to superior temporal line Bleeding cause generalized swelling of scalp Called dangerous layer of scalp-emissary veins open here and carry any infections inside the brain (venous sinus) Bleeding lead to black eye Caput succedaneum in new born

Pericranium Is the periosteum of skull n Loosely attached to surface of bone but is firmly adherent to the sutures n Injury deep to it take the shape of bone (cephalhaematoma) n Scalping injury- should be replaced and stitched because healing is better n

n Caput succedaneum n cephalhaematoma

Blood supply n Arteries ¨ ¨ ¨ n Supratrochlear Supraorbital Superficial temporal Posterior auricular artery Occipital artery Veins-follows the artery

Nerve supply n In front of auricle ¨ ¨ ¨ n Supratrochlear n. Supraorbital n. Zygomaticotemporal n. Auriculotemporal n. Temporal branch of facial n. Behind auricle ¨ ¨ ¨ Greater auricular n Lesser occipital n. Greater occipital n. Third occipital n. Post. Auricular branch of facial n.

Lymphatics n Anterior part ¨ Preauricular n (parotid) gr. of lymph node Posterior part ¨ Posterior (mastoid) gr. of lymph node &occipital gr. of lymph node

Face Boundaries n Extends superiorly to the hair line, inferiorly to the chin and base of mandible, and on each side to auricle n Forehead is common to both scalp and face

Skin n n n Very vascular Due to rich vascularity face blush and blanch Wounds of face bleed profusely but heal rapidly Results of plastic surgery are excellent on face Facial skin is rich in sebaceous gland sweat gland Sebaceous gland keep the skin oily but also cause acne in adult Sweat gland regulate body temperature

Facial muscle n n Called muscle of facial expression and lie in superficial fascia Embryologically they develop from mesoderm of 2 nd branchial arch, therefore supplied by facial nerve

Orbicularis oculi n n 3 parts. Orbital part ¨ n Originate from medial part of medial palpebral ligament and form concentric rings, return to point of origin Action –closes the lids tightly Palpebral part Originate from lateral part of medial palpebral ligament ¨ Insert into lateral palpebral raphe ¨ n Action-closes the lids gently Lacrimal part Originate from lacrimal fascia& lacrimal bone ¨ Insert into upper &lower tarsi ¨ Action-dilate lacrimal sac

Orbicularis auris n Originate from maxilla above incisor teeth and insert into skin of lip. Action –closes the mouth

Buccinator n n Upper fibers ¨ Origin- from maxilla opposite molar teeth ¨ Insertion-upper lip Lower fibers ¨ Origin-from mandible opposite molar teeth ¨ Insertion-lower lip Middle fibers ¨ Origin –from pterigomandibular raphe ¨ Insertion-decussate before passing to lips Action- prevent accumulation of food in vestibule of mouth

Platysma n n n Origin– upper part of pectoral and deltoid fascia Insertion– base of mandible, skin of lower face and lip Action– releases pressure of skin on the subjacent veins, depress mandible, pulls angle of mouth downwards

Nerve supply of face n Motor supply ¨ Facial nerve

Sensory supply n n Ophthalmic division n Supratrochlear n Supraorbital n Lacrimal n Infratrochlear n External nasal Maxillary nerve n Infraorbital n Zygomaticofacial and zygomaticotemporal Mandibular nerve n Auriculotemporal n Buccal nerve n Mental Skin over the mandibular angle is supplied by ant. Div. Of greater

Blood supply of face n Arterial supply¨ Facial artery ¨ Superficial temporal artery ¨ Ophthalmic artery n n Supraorbital and Supratrochlear

Venous drainage n n n Vein follow the arteries and drain into common facial vein and retromandibular vein Deep connections of facial vein Communication between supraorbital &superior ophthalmic vein With pterigoid plexus of vein through deep facial vein. Superior ophthalmic vein & ptergoid plexus of vein communicate with cavernous sinus

Lymphatic drainage n n 3 territories. Upper territories- greater part of forehead, lateral ½ of eye lid, conjunctiva, lateral part of cheek and parotid area– preauricular lymph node (parotid) Middle territories- median part of forehead, external nose, upper lip, lateral part of lower lip, medial ½ of eye lid, medial part of cheek, greater part of lower jaw– submandibular lymph node Lower territories- central part of lower lip, chin– sub mental lymph node

Applied n Trigeminal neuralgia ¨ ¨ n Maxillary and mandibular nerve are involved Excruciating pain in the region of distribution of these nerve In infranuclear lesions of facial nerve (eg, bell’s palsy)whole face is paralyzed ¨ c/f n n n Affected side is motionless Loss of wrinkles Eye cannot be closed In smiling the mouth is drawn to normal side During mastication food accumulates in vestibule of mouth In supranuclear lesions of facial nerve only the lower part of face is paralyzed. The upper part (frontalis &part of orbicularis oculi) escapes due to its bilateral innervation

n Dangerous area of face- infections from face mainly from upper lip & nose can go to cavernous sinus through ophthalmic vein and deep facial vein