3,326
edits
Changes
Jump to navigation
Jump to search
no edit summary
*Digastricus muscle
*Digastricus muscle
**Origin: paracondylar process of occipital bone
**Origin: paracondylar process of [[Skull and Facial Muscles - Anatomy & Physiology#Occipital Bone (os occipitale)|occipital bone]]
**Insertion: angle of mandible
**Insertion: angle of [[Skull and Facial Muscles - Anatomy & Physiology#Mandible (mandibula)|mandible]]
**Two bellies:
**Two bellies:
***Caudal half from the second visceral arch innervated by facial nerve ([[Nervous System - CNS - Anatomy & Physiology#Innervation - Cranial Nerves|CN VII]])
***Caudal half from the second visceral arch innervated by facial nerve ([[Nervous System - CNS - Anatomy & Physiology#Innervation - Cranial Nerves|CN VII]])
*Masseter muscle
*Masseter muscle
**Origin: maxilliary region of skull and zygomatic arch
**Origin: [[Skull and Facial Muscles - Anatomy & Physiology#Maxilla|maxilliary]] region of skull and zygomatic arch
**Insertion: wide area on caudal side of mandible
**Insertion: wide area on caudal side of [[Skull and Facial Muscles - Anatomy & Physiology#Mandible (mandibula)|mandible]]
**Several divisions
**Several divisions
**Unilateral and bilateral contraction
**Unilateral and bilateral contraction
*Lateral Pterygoid muscle
*Lateral Pterygoid muscle
**Origin: pterygopalatine region of skull
**Origin: [[Skull and Facial Muscles - Anatomy & Physiology#Pterygoid Bone (os pterygoideum)|pterygopalatine]] region of skull
**Insertion: lateral aspect of mandible
**Insertion: lateral aspect of [[Skull and Facial Muscles - Anatomy & Physiology#Mandible (mandibula)|mandible]]
**Also protrudes jaw (one-sided contraction)
**Also protrudes jaw (one-sided contraction)
*Medial Pterygoid muscle
*Medial Pterygoid muscle
**Origin: pterygopalatine region of skull
**Origin: [[Skull and Facial Muscles - Anatomy & Physiology#Pterygoid Bone (os pterygoideum)|pterygopalatine]] region of skull
**Insertion: medial aspect of mandible
**Insertion: medial aspect of [[Skull and Facial Muscles - Anatomy & Physiology#Mandible (mandibula)|mandible]]
**One-sided contraction to close jaw
**One-sided contraction to close jaw
**Origin: lateral surface of cranium
**Origin: lateral surface of cranium
**Insertion: coronoid process
**Insertion: coronoid process
**Pulls mandible dorsally
**Pulls [[Skull and Facial Muscles - Anatomy & Physiology#Mandible (mandibula)|mandible]] dorsally
**Also pulls mandible rostrally (overbite) and caudally (underbite)
**Also pulls mandible rostrally (overbite) and caudally (underbite)
'''Temperomandibular Joint'''
'''Temperomandibular Joint'''
*Articulation between the condylar process of the mandible and the mandibular process of the skull
*Articulation between the condylar process of the [[Skull and Facial Muscles - Anatomy & Physiology#Mandible (mandibula)|mandible]] and the mandibular process of the skull
*Compartmentalised joint for rotational movement and lateral slide (grinding)
*Compartmentalised joint for rotational movement and lateral slide (grinding)
'''Mandibular Symphasis'''
'''Mandibular Symphasis'''
*Rostral end of mandible
*Rostral end of [[Skull and Facial Muscles - Anatomy & Physiology#Mandible (mandibula)|mandible]]
*Fibrous joint bewteen the left and right halves of the mandible
*Fibrous joint bewteen the left and right halves of the [[Skull and Facial Muscles - Anatomy & Physiology#Mandible (mandibula)|mandible]]
*Only in dogs and ruminants
*Only in dogs and ruminants
*Precise occlusion
*Precise occlusion
*Mandibular bones can move apart independently by rotation
*[[Skull and Facial Muscles - Anatomy & Physiology#Mandible (mandibula)|Mandibular]] bones can move apart independently by rotation
*Stops jaw breakages (Canid)
*Stops jaw breakages (Canid)