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Orbicularis oculi
closes eyelids
Levator nasolabialis
lifts upper lip and nostril
Zygomaticus
draws the commissure of lips caudally
Buccinator
compresses cheeks, aids chewing
Orbicularis oris
closes lips
Platysma
draws lips caudally (towards the tail); superficial cutaneous muscle
Temporalis
elevates the mandible (largest in carnivores)
Masseter
closes jaw, lateral chewing force
Pterygoid (medial & lateral)
side-to-side grinding movement
Digastricus
opens jaw (dual innervation: CN V and VII)
Dorsal, ventral, medial, lateral rectus
move eye in corresponding direction
Dorsal & ventral oblique
rotate the globe
Retractor bulbi
retracts the eyeball into the orbit
Genioglossus
protrudes tongue
Hyoglossus
retracts and depresses tongue
Styloglossus
elevates and retracts tongue
Intrinsic muscles
alter tongue shape
Brachiocephalicus
advances limb, extends shoulder and head, turns head sideward
Sternocephalicus
draws head and neck to the side
Sternohyoideus / Sternothyroideus
draw hyoid/larynx caudally
Longus colli
ventral to cervical vertebrae; flexes neck
Scalenus
originates from ribs; assists respiration, flexes neck
Splenius
dorsal to longus capitis; extends/raises the head
Semispinalis capitis
extends the head and neck
Longissimus capitis et atlantis
extends and rotates head
Trapezius
elevates and abducts the limb
Rhomboideus
elevates the limb
Serratus ventralis
supports trunk, depresses scapula
Latissimus dorsi
draws limb caudally, flexes shoulder
Omotransversarius
advances limb
Superficial pectorals
adducts the limb
Deep pectorals
supports trunk, adducts and draws limb caudally
Supraspinatus
extends shoulder
Infraspinatus
stabilizes and abducts shoulder
Subscapularis
adducts limb
Deltoideus
flexes shoulder
Teres major/minor
flex shoulder
Biceps brachii
flexes elbow, extends shoulder
Triceps brachii
extends elbow, long head flexes shoulder
Brachialis
flexes elbow
Tensor fasciae antebrachii
extends elbow
Extensor carpi radialis
extends carpus
Common digital extensor
extends digits and carpus
Lateral digital extensor
extends digits
Ulnaris lateralis
flexes carpus
Flexor carpi radialis
flexes carpus
Flexor carpi ulnaris
flexes carpus
Superficial digital flexor
flexes carpus and digits
Deep digital flexor
flexes digits and carpus
Pronator teres & quadratus
pronate forearm (minor role)
Supinator
supinates forearm
External intercostals
inspiration
Internal intercostals
expiration
Serratus dorsalis cranialis
lifts ribs during inspiration
Serratus dorsalis caudalis
draws last ribs caudally during expiration
Rectus Thoracis
assists with inspiration (originates from first rib to costal cartilages)
Transversus Thoracis
aids in expiration; lies on internal surface of sternum