Tongue

Question	Answer
IS?	Mass of striated muscle fibres covered b mucus membranes
Functions	Deglutination(swallowing) Speech Taste Sexual arousal
Taste buds	-Filiform papillae(tips) -Fungiform papillae(sides) Vallate papillae(20, posterior aspect)
Epithelium	Stratified squamous non-keratinised Note: Can become keratinised in smokers
Sulcus terminalis	separates tongue into anterior 2/3 and posterior 1/3
Foramen cecum	site of origin of thyroid gland
Lingual thyroid	thyroig gland doesnt descend into neck-congenital anomaly
Lingual frenulum	attaches tongue to floor of mouth Lingual veins Plica fimbriata produced by sublingual salivary gland
Muscles 2 types	Intrinsic Extrinsic
Intrinsic	Within tongue No extra bony attachments Longitudinal, transverse, vertical muscles Alter shape of tongue
Extrinsic	Originate from external bones and structures -Styloglossus -Hyoglossus -Palatoglossus -Genioglossus
Styloglossus	elevation and retraction of the tongue
hyoglossus	depression of the tongue
palatoglossus	geelevation of the tongue
genioglossus	protrusion of the tongue
nerve supply	Motor Sensory
Motor	Hypoglossal nerve except palatoglossus-pharyngeal plexus
sensory	Posterior 1/3-glossopharyngeal Anterior 2/3- Facial nerve(chorda tympani)-for taste Lingual nerve-pain, temp, touch
Blood supply	Lingual artery-branch of external carotid
Lymphatics	tip-submental lymph nodes rest of anterior-submandibular posterior-deep cervical

Resource summary

	Created by jemimanerima over 9 years ago