ANAT 2626 Chapter 7 - Scalp, Face and Parotid Region (Mercy Navis)

ANAT 2626 Chapter 7 - Scalp, Face and Parotid Region (Mercy Navis)

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1 Chapter 7 - Pages 842 to 864 Scalp and Face Scalp 1. consists of skin ( normally hair bearing ) and subcutaneous tissue that cover the neurocranium 2. it extends from the superior nuchal lines on the occipital bone to the supra - orbital margins of the frontal bone 3. laterally, it extends over the temporal fascia to the zygomatic arches Layers of scalp The scalp is composed of Fve layers of tissue, the Frst three of which are connected intimatelas a unit 1. skin 2. connective tissue 3. epicaranial aponeurosis 4. loose areolar tissue 5. pericranium Skin 1. is thin except in the occipital region, containing many sweat and sebaceous glands and hair follicles 2. has an abundant arterial supply, good venous and lymphatic drainage Connective tissue 1. forms a thick, dense, richly vascularized, subcutaneous layer that is well supplied with cutaneous nerves 2. this layer contains the nerves and blood vessels of the scalp Aponeurosis ( epicranial aponeurosis ) 1. broad, strong, tendinous sheet that covers the calvaria 2. it serves as the attachment for muscle bellies covering from the forehead to the occiput ( occipitofrontalis ) 3. from the temporal bones on each side ( temporoparietalis and superior auricular muscles ) Loose areolar tissue 1. is a sponge- like layer, including potential spaces that may distend with ±uid as a result of injury or infection 2. it allows the free movement of the scalp proper ( the Frst three layers ) Pericranium 1. a dense layer of connective tissue, that forms the external periosteum of the neurocranium 2. it is Frmly attached and continuous with the Fbrous tissue in the cranial sutures Nerves of the scalp Innervation of the scalp anterior to the auricle is through branches of all three divisions of trigeminal nerve ( cranial nerve V ) Posterior to the auricle, from the spinal cutaneous nerves ( C2, C3 ) Sensory nerves
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2 Supratrochlear nerve 1. is the larger terminal branch of frontal nerve from ophthalmic nerve 2. it supplies the skin of the forehead and scalp to vertex Supraorbital nerve 1. the smaller terminal branches of frontal nerve from ophthalmic nerve 2. it supplies the skin and pericranium of anteromedial forehead Zygomaticotemporal nerve 1. is a branch of zygomatic nerve from maxiallry division of trigeminal nerve ( cranial nerve V ) 2. supplies hairless skin and anterior part of the temporal fossa Auriculotemporal nerve 1. is a branch of posterior trunk of mandibular division of trigeminal nerve ( cranial nerve V ) 2. supplies the skin of the posterior 2/3 of temporal region Motor nerve Temporal branch of facial nerve supplies the frontalis muscle Posterior part of the scalp Sensory nerves Great auricular nerve 1. arises from ventral / anterior rami of C2 C3 via cervical plexus 2. supplies the skin overlying angle of mandible, inferior lobe of auricle and parotid sheath Lesser occipital nerve 1. arises from the ventral / anterior ramus of C2 C3 via cervical plexus 2. supplies the scalp posterior to auricle Greater occipital nerve
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ANAT 2626 Chapter 7 - Scalp, Face and Parotid Region (Mercy Navis)

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