Thoracic Limb Extrinsic Muscles Flashcards
(30 cards)
What are the two functions of the thoracic limb?
- Weight Bearing
2. Propulsion
What sits in the inter tubercular groove?
The biceps brachia tendon
Which is bigger: the lateral epicondyle or the medial epicondyle?
Medial
Which species does not have the supratrochlear foramen and what does it have instead? What passes through this?
- The cat
- supracondylar formamen
- brachial artery and the median nerve
The trochlea is (Medial/lateral) and articulates with what? The capitulum is (Medial/lateral) and articulates with what?
- Medial, radius and ulna
- Lateral, articulates with radius
Which structures of the radius are in charge of weight support?
Head, trochlea, and styloid process
What is the function of the ulna?
Muscular attachment
Which parts of the ulna are prone to fracture?
- anconeal process
- medial and lateral coronoid processes
The _____ ______ is the projection on the distal end of the ulna.
Styloid Process
What are the four anatomic areas of the manus?
- Carpal bones (proximal carpal (radial, ulnar accessory) and distal carpal (first, second, third, fourth))
- Metacarpal bones (first, second, third, fourth, fifth)
- 5 digits (each with three phalanges: Proximal, middle, distal)
- Sesamoid bones (Between metacarpal bones and phalanges)
The middle phalanx is absent in digit ____.
one
_____ ______ are small bones embedded in tendons or joints that reduce friction during movement.
-Sesamoid bones
The distal phalanx is composed of the _____ ____ (a thin shelf, circle around the base), the ____ _____ (conical extension of the distal phalanx), and the _____ ____, which is the dorsal part of the base.
- Ungual crest
- Ungual process
- Extensor process
The extensor process is the insertion site for the _____ ____ ____ muscle on digits two through five.
common digital extensor
The _____ _____ of the ______ is the longitudinal fibrous septum between the right and left epaxial muscles. It serves as an attachment site for many ____ muscles.
- Median Raphne of the Neck
- Cervical
The ____ ____ is the deep fascia of the trunk. It arises from the ______ ligaments and spines of the ____ and ____ vertebrae. It covers the _____ of the vertebrae and serves as an attachment site for many _____.
- Thoracolumbar fascia
- supraspinous
- thoracic
- lumbar
- muscles
- muscles
Extrinsic muscles of the of the thoracic limb join to the trunk by _____, not by the conventional joint. What is the clinical significance of this?
- Synsarcosis
- Amputation of the forelimb is performed by simply transecting the extrinsic muscles to remove the limb
The superficial pectoral muscle is innervated by the ____ ____ nerve. What are the two components? What is their function?
- cranial pectoral
- Composed of the descending pectoral muscle and the transverse pectoral muscle, which function in adduction
The deep pectoral muscle is innervated by the _____ ____ nerve. What is its function?
- Caudal pectoral
- To pull the trunk cranially
The brachiocephalicus muscle is innervated by the what nerve(s). What is this muscle’s function?
- accessory
- ventral branches of the cervical spinal
- To advance the limb
What are the parts of the brachiocephalicus muscle? What is the intersection called?
- Cleidobrachialis
- Cleidocervicalis (pars cervicalis and the pars mastoideus)
- Clavicular Intersection
The sternocephalicus is innervated by what nerve(s). What is this muscle’s functions? What are the two parts?
- Accessory
- Cervical spinal
- Draws the head and neck to the side
- Composed of the mastoid and occipital parts
The omotransversarius is innervated by what nerve(s). What is its function?
- Accessory
- Advance the limb
The trapezius is innervated but what nerve(s). What are its parts and functions?
- Accessory
- Composed of the cervical and thoracic parts
- Elevates/abducts the limb
