Anatomy Muscles of Cat

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Anatomy Review : 

Anatomy Review Cat Muscles Written by Eduardo Alvarez & Roberto Martinez Students of Professor Gonsalves’ LACC Anatomy 1 Class

MUSCLES OF MASTICATION : 

MUSCLES OF MASTICATION

Masseter : 

Masseter Origin: Maxilla and Zygomatic Arch Insertion: Mandible Action: Elevates Mandible (closing mouth), Protracts Mandible

Temporalis : 

Temporalis Origin: Temporal Bone Insertion: Mandible Action: Elevates and Retracts Mandible

Digastric : 

Digastric Origin: Occipital Bone and Mastoid Process Insertion: Mandible Action: Depresses Lower Jaw

Mylohyoid : 

Mylohyoid Origin: Layrnx Insertion: Hyoid Bone Action: Raises Floor of Mouth and Pulls Hyoid Forward

NECK MUSCLES THAT MOVE THE HEAD : 

NECK MUSCLES THAT MOVE THE HEAD

Sternomastoid (only in cats) : 

Sternomastoid (only in cats) Origin: Manubrium Insertion: Mastoid Process Action: Turns and Depresses Head

Cleido-mastoid : 

Cleido-mastoid Origin: Clavicle Insertion: Mastoid Process Action: Pulls Head Laterally and Pulls Clavicle Cranial

MUSCLES OF HYOID, LAYRNX, & TONGUE : 

MUSCLES OF HYOID, LAYRNX, & TONGUE

Sternohyoid : 

Sternohyoid Origin: First Rib (Intercostal) Insertion: Hyoid Bone Action: Pulls Hyoid Caudally, Raises Ribs and Sternum

Sternothyroid : 

Sternothyroid Origin: First Rib (Intercostal) Insertion: Larynx Action: Pulls Larynx Caudal (down)

Thyrohyoid : 

Thyrohyoid Origin: Larynx Insertion: Hyoid Bone Action: Raises Larynx

Geniohyoid(deep to Mylohyoid) : 

Geniohyoid(deep to Mylohyoid) Origin: Mandible Insertion: Hyoid Bone Action: Pulls Hyoid Cranial (up)

MUSCLES THAT ATTACH PECTORAL APPENDAGES TO THE VERTEBRAL COLUMN : 

MUSCLES THAT ATTACH PECTORAL APPENDAGES TO THE VERTEBRAL COLUMN

Trapezius : 

Trapezius Origin: Occipital Bone and Cervical and Thoracic Vertebrae Insertion: Scapula Action: Raises Clavicle, Adducts, Elevates and Depresses Scapula

Latissimus Dorsi : 

Latissimus Dorsi Origin: Thoracic and Lumbar Vertebrae Insertion: Humerus Action: Pulls Arm Dorsal (back) and Caudal (down)

RhomboideusCapitis : 

RhomboideusCapitis Origin: Lamboidal Ridge Insertion: Scapula Action: Pulls Scapula Cranial (up)

RhomboideusMinor : 

RhomboideusMinor Origin: Maxilla and Zygomatic Arch Insertion: Mandible Action: Elevates Mandible (closing mouth), Protracts Mandible capitis

RhomboideusMajor : 

RhomboideusMajor Origin: Thoracic Vertebrae Insertion: Scapula Action: Pulls Scapula Dorsally (toward back) and Medially (towards midline) capitis

LevatorScapulaeVentralis : 

LevatorScapulaeVentralis Origin: Occipital Bone and Atlas (C1) Insertion: Scapula Action: Pulls Scapula Cranial (toward head)

MUSCLES THAT ATTACH PECTORAL APPENDAGES TO VENTRAL AND BODY WALL : 

MUSCLES THAT ATTACH PECTORAL APPENDAGES TO VENTRAL AND BODY WALL

Pectoante-brachialis(cat only) : 

Pectoante-brachialis(cat only) Origin: Manubrium Insertion: Forearm (proximal end) Action: Adducts Arm

Pectoralis Major : 

Pectoralis Major Origin: Sternum Insertion: Humerus Action: Adducts Arm

Pectoralis Minor : 

Pectoralis Minor Origin: Sternum Insertion: Humerus Action: Adducts Arm

Xiphi-humeralis(cat only) : 

Xiphi-humeralis(cat only) Origin: Xiphoid Process Insertion: Humerus Action: Adducts Arm

SerratusAnterior : 

SerratusAnterior Origin: First 10 Ribs Insertion: Scapula Action: Pulls Scapula Forward, Depresses Scapula

MUSCLES OF THE SHOULDER : 

MUSCLES OF THE SHOULDER

(Deltoid)Clavodeltoid : 

(Deltoid)Clavodeltoid Origin: Clavicle Insertion: Humerus Action: Flexes Forearm

(Deltoid)Acromio-deltoid : 

(Deltoid)Acromio-deltoid Origin: Scapula Insertion: Humerus Action: Flexes Humerus and Rotates it Outward

(Deltoid)Spinodeltoid : 

(Deltoid)Spinodeltoid Origin: Clavicle Insertion: Humerus Action: Flexes Humerus and Rotates it Outward

Supraspinatus : 

Supraspinatus Origin: Scapula Insertion: Humerus Action: Extends Humerus

Infra-spinatus : 

Infra-spinatus Origin: Scapula Insertion: Humerus Action: Rotates Humerus Outward Teres major Rhomboideus major

Teres Major : 

Teres Major Origin: Scapula Insertion: Humerus Action: Flexes Humerus and Rotates Humerus Inward Rhomboideus major

Sub-Scapularis : 

Sub-Scapularis Origin: Subscapular Fossa Insertion: Humerus Action: Pulls Humerus Medially

MUSCLES OF UPPER ARM : 

MUSCLES OF UPPER ARM

Triceps Brachii : 

Triceps Brachii Origin: Long Head: Scapula Lateral Head and Medial Head: Humerus Insertion: Ulna Action: Extends Forearm Lateral head Medial head Long head

Biceps Brachii : 

Biceps Brachii Origin: Scapula Insertion: Radial Tuberosity (Radius) Action: Flexes (lowers) and Supinates (raises) Forearm

Brachialis : 

Brachialis Origin: Humerus Insertion: Ulna Action: Flexes (lowers) Forearm

MUSCLES OF THE TRUNK : 

MUSCLES OF THE TRUNK Thoracic Region

External Intercostals : 

External Intercostals Origin: Caudal border of rib above Insertion: Crainal border of rib below Action: Raises Rib (Inhalation) Origin: Cranial border of rib below Insertion: Caudal border of rib above Action: Draw Adjacent Ribs Together and Lower Rib Internal Intercostals

Rectus Abdominous : 

Rectus Abdominous Origin: Pubic Bone Insertion: Costal Cartilage of 1st through 4th Ribs Action: Compresses Abdomen

Extenal Abdominal Oblique : 

Extenal Abdominal Oblique Origin: Last nine Ribs Insertion: Sternum to Pubis Action: Compresses Abdomen

Transversus Abdominis : 

Transversus Abdominis Origin: False Ribs, Lumbar Vertabrae, Ilium Insertion: Linea Alba Action: Compresses the Abdomen

Extensor dorsi communis ? : 

Extensor dorsi communis ? Origin: Humerus Insertion: Tendons on 4 digits Action: Extends digits

MUSCLES OF THE HIP REGION : 

MUSCLES OF THE HIP REGION

Tensor fascia latae : 

Tensor fascia latae Origin: Ilium Insertion: Patella and Tibia Action: Extends Thigh, Aids in Abduction and Rotation

Caudo-femoralis : 

Caudo-femoralis Origin: Caudal (Coccyx) Vertebrae Insertion: Patella Action: Abducts Thigh and Extends Shank

Gluteus Maximums : 

Gluteus Maximums Origin: Sacral and Caudal Vertebrae Insertion: Femur Action: Abducts Thigh

Gluteus Medius : 

Gluteus Medius Origin: Sacral and Caudal Vertebrae, & Iliac Insertion: Femur Action: Abducts Thigh

MUSCLES OF THE THIGH : 

MUSCLES OF THE THIGH Dorsal Femoral Group (Flexors)

Biceps Femoris : 

Biceps Femoris Origin: Ischial Tuberosity Insertion: Patella & Tibia Action: Adducts Thigh, Flexes Shank

Semi-membranosus : 

Semi-membranosus Origin: Ischial Tuberosity Insertion: Femur Action: Extends Thigh

Semi-tendinosus : 

Semi-tendinosus Origin: Ischial Tuberosity Insertion: Tibia Action: Flexes Shank

MUSCLES OF THE THIGH : 

MUSCLES OF THE THIGH Ventral Femoral Group (Extensors)

Sartorius : 

Sartorius Origin: Ilium Insertion: Patella Action: Adducts and Rotates Femur, Extends Tibia

Quadriceps Rectus femoris : 

Quadriceps Rectus femoris Origin: Ilium Insertion: Patella Action: Extends Lower Leg

Quadriceps Vastus Lateralis : 

Quadriceps Vastus Lateralis Origin: Femur Insertion: Patella Action: Extends Lower Leg

Quadriceps Vastus Medialis : 

Quadriceps Vastus Medialis Origin: Femur Insertion: Patella Action: Extends Lower Leg

MUSCLES OF THE THIGH : 

MUSCLES OF THE THIGH Medial Femoral Group

Gracilis : 

Gracilis Origin: Ischium and Pubis Insertion: Tibia Action: Adducts Thigh and Pulls Caudally (down)

Adductor Longus : 

Adductor Longus Origin: Pubis Insertion: Femur Action: Adducts Thigh

Adductor Femoris : 

Adductor Femoris Origin: Pubis & Ischium Insertion: Femur Action: Extends Thigh

MUSCLES OF THE LOWER LEG : 

MUSCLES OF THE LOWER LEG

Gastrocnemius : 

Gastrocnemius Origin: Femur Insertion: Calcaneus Action: Extends Foot

Soleus : 

Soleus Origin: Fibula Insertion: Metatarsals Action: Extends Foot

Tibialis Anterior : 

Tibialis Anterior Origin: Tibia and Fibula Insertion: First Metatarsals Action: Flexes Foot