Extrinsic Muscles Thoracic Limb

Vocabulary flashcards covering the anatomical terminology, origins, insertions, and primary functions of the extrinsic limb muscles.

Name the green muscle (full muscle)

Brachiocephalicus

What 3 muscles make up the Brachiocephalicus?

Cleidobrachialus, Cleidomastoideus, and Cleidocervicalis

What is the origin, insertion, and functions of the Cleidocervicalis?

O - Clavicular Tendon, I - Neck

Protracts

Depresses the head and neck

What is the origin, insertion, and functions of Cleidomastoideus?

O - Clavicular tendon, I - Mastoid process of the skull

Protracts and depresses the head and neck

What is the origin, insertion, and functions of Cleidobrachialus?

O - Humeral crest of the humerus, I - Clavicular tendon

Protracts

Extends

What muscle is the primary protractor? And what muscle is it’s antagonist?

Brachiocephalicus

Latissimus Dorsi - Antagonist

What muscle is the primary retractor? What is it’s antagonist?

Latissimus Dorsi

Brachiocephalicus - Antagonist

Name the pink muscle

Trapezius Cervicis

What is the origin, insertion, and functions of the Trapezius Cervicus?

O - Dorsal Midline of the neck, I - Scapular Spine

Protracts

Elevates the Scapula

Abducts the limb

Name the Orange muscle

Omotransversarius

What is the origin, insertion, and functions of the Omotransversarius

O - Distal end of scapular spine, I - Wing of Atlas

Protracts

Name the Purple muscle

Latissimus Dorsi

What is the origin, insertion, and functions of Latissimus Dorsi?

O - Thoraco - Lumbar region of the spine, I - Teres Major Tuberosity on the humerus

Retracts

Flexes the limb

Name the Brown muscle

Pectoralis Descendens

What is the origin, insertion, and functions of Pectoralis Descendens?

O - Sternum (cranial portion), I = Deltoid Tuberosity of the humerus

Adducts

Protracts

Pronates (rotates medially)

Name the Dark Blue muscle

Pectoralis Transversus

What is the origin, insertion, and functions of Pectoralis Transversus

O - Sternum, I - Deltoid Tuberosity of the humerus

Adducts

Protracts

Pronates (rotates medially)

Name the red muscle

Pectoralis Ascendens (Deep pectoral)

What is the origin, insertion, and functions of the Pectoralis Ascendens?

O - Caudal 2/3 of sternum, I - Medial Tubercule of humerus

Adducts

Retracts

Name the Light Blue muscle

Trapezius Thoracis

What is the origin, insertion, and functions of Trapezius Thoracis?

O - Thoracic Veterbra, I - Scapular Spine

Abducts the limb

Elevates the Scapula

Name the Mint - colored muscle

Rhomboideus Cervicis

What is the origin, insertion, and functions of the Rhomboideus Cervicis?

O - Medial Raphe (of cervical - thoracic vertebrae), I - Medial surface of Scapula

Abducts the limb

Elevates the Scapula

Name the Tan muscle

Rhomboideus Thoracis

What is the origin, insertion, and functions of the Rhomboideus Thoracis?

O - Thoracic vertebrae, I - Medial surface of Scapula

Abducts the limb

Elevates the Scapula

What is the Dark Orange muscle?

Serratus Ventralis

What is the origin, insertion, and functions of the Serratus Ventralis?

SLING MUSCLE

Supports the weight of the trunk