Parotid salivary gland


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Parotid salivary gland, structure and finction

Published in: Health & Medicine

Parotid salivary gland

  1. 1. Stomodeum Buccopharyngeal membrane Proctodeum Cloacal membrane Fore-gut Mid-gut Hind-gut Pre-Laryngeal (Cephalic part) Post-Laryngeal (Caudal part) GUT TUBE Pharynx and Part of definitive Mouth cavity Skin ectoderm Parotid gland 4th week of IUL Ectodermal furrow
  2. 2. The salivary glands arise as buds from The epithelial lining of the mouth; the parotid appears during the fourth week In the angle between the maxillary process and the mandibular arch Opening of parotid duct indicates position of angle of primitive mouth
  3. 3. Sternomastoid Ramus of mandible Parotid region Ext. acoustic meatus
  4. 4. Salivary Glands : 3 paired – Parotid Submandibular Sublingual Scattered - Tongue Palate Cheeks Lips Function : Chewing Swallowing Saliva (Digestion by Enzymes) Serous & Mucinous
  5. 5. Parotid gland: Largest saliv. Gland Wt. 15 gms Serous secretion Capsule – True – condensation of fibrous stroma of gland False - investing deep fascia Superficial thick – adherent to gland Deep – thin – attached to styloid process forms – stylomandibular Lig. (separates parotid from submandibular sal. gland.
  6. 6. Parotid – 3 sided pyramid Apex Superior surface (Base) Superficial surface Antero-m edial surface Postero-m edial surface Anterior border Posterior border Medial border
  7. 7. Presenting parts 01. Apex 02. Base 03. Superficial (lateral) surface 04. Antero-medial surface 05. Postero-medial surface
  8. 8. 1. Apex Overlaps post. Belly of digastric appears in carotid triangle Structures passing thro’ 01. Cervical branch of facial nerve 02. Ant. division of retro-mandibular vein 03. Formation of ext. jug. vein
  9. 9. 2. Base Concave related to; Ext. acoustic meatus Post. Part of TM joint Structures passing thro’ 01. Temp. br. Of facial nerve 02. Sup. Temp. vessels 03. Auriculo-temp. nerve
  10. 10. 3. Antero-medial surface Deeply grooved by ramus of mandible; Relations: 01. Post. Inf. Part of masseter 02. Post. Border of ramus of mandible 03. Med. Pterygoid muscle insertion 04. Outer lip – branches of facial nerve 05. Inner lip - Maxillary art. Medial to neck of mandible 01 03 02 05 05
  11. 11. 3. Postero - medial surface Extensive Relations: • Mastoid process with Sternomastoid Post. Belly of digastric 02. Styloid process with muscles 03. Transverse process of atlas and Rectus capitis lateralis 04. Deep to styloid – Int. carotid - Int. Jug. Vein in between 9, 10, 11, 12 cr. nerves 05. Facial nerve after emerging from SM foramen pierces the gland 06. Ext. carotid first lodges in groove then pierces the gland
  12. 12. 1. Anterior border From above downwards: 01. Zygomatic br. of facial nerve 02. Transverse facial vessels 03. Upper buccal br. of facial nerve 04. Acc. Parotid gland & duct if present 05. Parotid duct 06. Lower buccal br. of facial nerve 07. Marginal mandibular br. of facial nerve 2. Posterior border Rests on masseter 01. Post. Auricular br of facial nerve 02. Post. Auricular vessels
  13. 13. Parotid duct (stensen’s duct) 5 cms long, starts at mid point of ant. Border Runs on masseter, opens opp. crown of upper 2nd Molar Sup: Upper buccal br. of facial, Transverse facial vessels. Inf: Lower buccal br. of facial Pierces:1.Buccal pad of fat, 2. Buccopharyngeal fascia 3. Buccinator
  14. 14. Parotid duct Surface marking
  15. 15. Branching of facial nerve (Radiate like goose’s foot – Pes anserinus) Emerges from SM foramen Pierces post. Medial surface Lies superficial to Retromeandibualr vein & Ext. carotid art. Divides into 1. Temporo faicial trunk - Temporal Zygomatic 2. Cervico facial trunk - Buccal Marginal mandibular Cervical
  16. 16. Processes of the parotid gland: 01. Facial process - Superficial to masseter along parotid duct 02. Acc. Parotid gland and duct if present 03. Pterygoid process – Bet’ mandibular ramus and ptrygoid muscle 04. Glenoid process - Bet. Ext meatus and capsule of TM joint 05. Pre and post styloid processes in front related to int. carotid behind related to int. Jug. Vein
  17. 17. Structures passing through parotid 1. Facial nerve 2. Retromandibular vein 3. External carotid
  18. 18. Blood supply Arterial – branches of ext. carotid Veins - to ext. jugular vein Nerve supply – Secretomotor from both Parasympathetic – Serous Inf. Salivatory nucleus - medulla (auriculo temporal) Sympathetic - Mucinous Sup. Cerv. ganglion (Ext. carotid art.) Vasomotor
  19. 19. Applied anatomy Parotitis – ext capsule adherent – more painful Parotid abscess – horizontal incision Mixed parotid tumor – facial nerve not involved Frey’s syndrome – Penetrating wounds secretomotor fibres of auriculotemporal join with great auricular perspiration of skin covering parotid during eating