PAROTID GLAND
parotid region
- features
- largest of salivary gland
- situated below external acoustic meatus
- between the ramus of mandible and sternocleidomastoid
- structures within parotid gland
- arteries
- veins
-
- leaves the skull by passing through stylomastoid foramen
- extracranial course
- 1. crosses the lateral side of base of styloid process
- then enters the posteromedial surface of partodi gland
- branches at its exit from stylomastoid foramen
- communicating branches with adjacent cranial and spinal nerves
- posterior auricular nerve arises just below the stylomastoid foramen
- ascends between mastoid process and external acoustic meatus
- supplies
- auricularis posterior
- occipitalis
- intrinisic muscles on back of auricle
- digastric branch arises close to previous nerve
- short and supplies posterior belly of digastric
- stylohyoid branch arises with digastric branch
- long and supplies stylohyoid muscle
- terminal branches
- temporal branches cross zygomatic arch and supply
- auricularis anterior
- auricularis superior
- intrinsic muscles on the lateral side of ear
- frontalis
- orbicularis oculi
- corrugator supercili
- zygomatic branches
- run across zygomatic bone
- supply orbicularis oculi
- buccal branches are two in number
- marginal mandibular branch
- cervical branch
- emerges from apex of parotid gland
- runs downwards and forwards in the neck to supply platysma
- bells palsy
- nerve supply
- parasympathetic nerves are secretomotor
- preganglionic fibres begin in inferior salivatory nucleus
- pass through glossopharyngeal nerve
- tympanic branch
- relay in otic ganglion
- sympathetic nerves
- postganglionic
- vasomotor
- derived from plexus around middle meningeal artery
- travel along branches of maxillary,external carotid artery and their branches
- sensory nerves
- parotid duct or stensons duct
- contains
- largest salivary gland
- histology
- it is a serous acini
- external features
- surfaces
- superficial
- largest surface
- covered by
- skin
- superficial fascia
- containing anterior branches of great auricular nerve
- preauricular or superficial parotid lymph nodes
- posterior fibres of platysma
- risorius
- parotid fascia which is thick and adherent
- anteromedial
- grooved by posterior border of ramus of mandible
- related to
- masseter
- lateral surface of temporomandibular joint
- posterior border of the ramus of mandible
- medial pterygoid
- emerging branches of facial nerve
- posteromedial
- moulded to mastoid
- moulded to styloid processs
- structures attached to them
- related to
- relations
- borders
- anterior
- separates superficial surface from anteromedial surface
- extends from anterior part of the superior surface to the apex
- following structures emerge at this border
- parotid duct
- terminal braches of facial nerve
- transverse facial vessels
- posterior
- separates superficial surface from posteromedial surface
- overlaps sternocleidomastoid
- medial / pharyngeal edge
- separates anteromedial surface from posteromedial surface
- related to lateral wall of pharynx
- blood supply
- parotid lymph nodes
- CLINICAL ANATOMY
- parotid abscess
- caused by spread of infection from opening of parotid duct
- drained by making holes (hiltons method)
- mixed parotid tumour is slow growing tumour
- parotid calculi may be formed in the parotid duct
Discussion