Forelimb Flashcards
Scapula
Shoulder Joint
Humerus
Elbow Joint
Radius
Ulna
Carpus
Metacarpal bones
Phalanges
Metacarpophalangeal joints
Interphalangeal joints
Greater tubercle
Crest of greater tubercle
Cranial border of humerus
Lateral epicondyle
Dorsal border (top)
Spine
Acromion
Shaft of humerus
Dorsal border (top)
Serrated face of scapula
Cranial border
Caudal border (left side)
Lesser tubercle
Teres major tuberosity
Medial epicondyle
Spinous processes of thoracic and lumbar vertebrae
Transverse processes of cervical vertebrae (neck)
Manubrium
Sternum
Xiphoid c.
Nuchal crest of occipital bone
Mastoid process of temporal bone
Atlas
Wing of the atlas (underneath)
Axis
S- sagittal process
P- mastoid process of the temporal bone
a- osseous external auditory meatus
nuchal crest of occipital bone (top)
Mastoid process of temporal bone
Spine of scapula
Supraspinous fossa
Infraspinous fossa (on the scapula)
Acromion
Serrated surface
Subscapular fossa
Supraglenoid tubercle
Coracoid process
gelnoid cavity
Head
neck
tricipital line
deltoid tuberosity
shaft
intertubercular groove
Olecranon
Proximal row of carpal bones
Distal row of carpal bones
Metacarpal tuberosities
Extensor processes of P3
Proximal sesamoid bones (digits 1 (1), 2-5 (2))
Rhomboideus m.
Ventral serrate m.
Pectoral mm.
Musculoskeletal joints - synsarcosis
It elevates the forelimb (draw shoulder dorsocranially). The extrinsic muscle lying deep to the trapezius. It extends from the median raphe of the neck, the thoracic vertebral spines, and the skull to the dorsal border of the scapula and scapular cartilage. It is divided into the cervical and thoracic parts in all species; the carnivores and pig have a small capital part.
Origin- Dorsal neck and thorax
Insertion- Dorsal border of scapula and scapular cartilage
Nerve- Dorsal br. of spinal nn. (cerv. and thoracic)
Rhomboideus M.
Antebrachiocarpal joint
Middle carpal joint
Carpometacarpal joint
- Metacarpophalangeal
- Interphalangeal proximal
- Interphalangeal distal
Subscapular fossa (on bone)
Medial glenohumeral ligament
Head of humerus
Tendon of biceps brachii m. (right side)
What is this ligament?
Supraspinous ligament
Which ligament is this?
Interosseus Ligament
What ligament is this?
Medial collateral ligament
What are these ligaments?
Oblique ligament of the elbow
Lateral collateral ligament
Annular ligament of radius
Which tendons or ligaments are these?
Digital flexor mm. tendons
Palmar annular ligament
Proximal digital ligament
Which ligaments are these?
Distal digital ligament
Proximal digital annular ligament
- Collateral ligaments of the metacarpophalangeal
- Collateral ligaments of the Interphalangeal joints
What are these ligaments?
Distal digital annular ligaments
Proximal digital annular ligaments
Cutaneous trunci m.
These muscles twitch the skin (to remove flies). The thin, interrupted sheets spread over the body in the superficial fasciae.
Cutaneous Trunci M.
Trapezius thoracis m.
Trapezius cervicis m.
Median dorsal raphe
Left picture:
Trapezius thoracis muscle
Trapezius cervicis muscle
Right picture:
Rhomboideus cervicis m.
Rhomboideus thoracis m.
Cleidomastoideus m.
Omotransversarius m.
Cleidobrachialis m.
Cleidocervalicis m.
Clavicular intersection
It supports the trunk. Raises thorax and shift weight to contralateral limb. The serrated, fan-shaped muscle extending from the last five cervical vertebrae and first seven or eight ribs to the medial surface of teh scapula.
Origin- Cervical part: vertebrae C3-7 Thoracic part: Ribs 1-7 or 8
Insertion- Dorsal border of scapula and scapular cartilage
Nerve- Long thoracic
Ventral serrate
It adducts and advances the limb (extends shoulder). The flat muscle extendingfrom the sternum to the cranial surface of the humerus. It is divided into two parts, a superficial descending pectoral and a deeper transverse pectoral, based on their fibre direction.
Origin- sternum
Insertion- Cranial surface of humerus
Nerve- Pectoral
Superficial pectoral m.
It functions to draw the limb caudally and adduct it (flex shoulder). The broad muscle extending from the sternum to the greater and lesser tubercles of the humerus.
Origin- Sternum
Insertion- Humerus (greater and lesser tubercles)
Nerve- Pectoral and lateral thoracic
Deep (ascending) pectoral
Loose connective tissue lying deep to the skin covering the entire body. Functionally, it provides a storehouse of water and fat, and insulates and protects the body. It allows structures to move easily against each other.
Superficial fascia or subcutis
The dense connective tissue under the superficial fascia, investing most of the body. Septa, extensions of the deep fascia, extend between muscles to bones, thus, compartmentalize muscles or groups of muscles.
Deep fascia
Local thickenings of teh deep fascia taht hold tendons in place (“a rope cable”)
Retinaculum
It elevates teh scapula, thus, the forelimb (elevates shoudler and draws it forward or backward). The triangular muscle extending from the dorsomedial neck and thorax to the spine of the scapula. It has two heads- cervical and thoracic.
Origin- Cervical: median fibrous raphe of neck
Thoracic: spines of the vertebrae T3-8 or 9
Insertion- spine of scapula
Nerve- Accessory
Trapezius thoracis m.
Trapezius cervicis m.
Part of the brachiocephalicus muscle (more specifically part of the cleidocephalicus- top bit above the clavicular intersection). It acts to pull the limb forward or flex neck laterally.
Origin- clavicular intersection
Insertion- skull (neck and skull/ mastoid process in carnivores)
Nerve- accessory and axillary
Cleidomastoideus m.
Draws the limb forward. Extends from the shoulder region to the cervical vertebrae. In the horse it is fused with the brachiocephalicus and doesn’t attach to the scapular spine, possibly because it has no acromion.
Origin- Wing of atlas
Insertion- Distal scapular spine
Nerve- accessory and cervical
Omotransversarius m.
Part of the brachiocephalicus muscle (bottom part). It pulls the limb forward or flexes the neck laterally. Not further divided as the cleidocephalicus is.
Origin- Clavicular intersection
Insertion- humerus
Nerve- accessory and axillary
Cleidobrachialis m.
Trapezius muscle
Latissimus dorsi m. (on trunk)
Omotransversarius m.
Cut edge of cutaneous trunci m.
Deep Pectoral m.
Deep pectoral m.
Deep pectoral muscles
Serratus ventralis m.
Serratus ventralis m.
Deltoideus m.
Flex shoulder. Extends from the scapular spine over the shoulder joint to the deltoid tuberosity of the humerus. Its aponeurosis covers the infraspinatous muscle.
Origin- spine of scapula (scapular part) and acromion process (acromial part- absent in horse and pig)
Insertion- deltoid tuberosity
Nerve- Axillary
Deltoideus m.
Teres major m.
Infraspinatus m.
Stabilize, flex, and extend shoulder. Lies deep to the aponeurosis of the deltoid muscle, originating from and filling the infraspinous fossa. Its strong tendon crosses the shoulder joint to insert on the greater tubercle of the humerus. It flexes the shoulder joint and acts with the supraspinatous muscle as the joint’s lateral collateral ligament. There is an infraspinatus bursa between the tendon of insertion and the greater tubercle.
Origin- Infraspinous fossa of scapula
Insertion- Humerus (greater tubercle)
Nerve- suprascapular
Infraspinatous m.
Flex shoudler. Arises from the caudal border of the scapula and inserts with the latissimus dorsi muscle on the medial side of the humerus.
Origin- Caudal border of scapula
Insertion- Teres major tuberosity of humerus
Nerve- Axillary
Teres major m.
Triceps brachii m.
Triceps brachii m.
Extend elbow and its long head flexes the shoulder. Composed of three or four heads. Its long head crosses the shoulder, and all heads cross the elbow joint to insert on the olecranon.
Origin- Caudal edge of scapula (long head); humerus (lateral head)
Insertion- olecranon
Nerve- radial
Triceps brachii m.
Spine of the scapula
Tendon sheath (surrounds tendon in intertubercular groove)
Biceps brachii m.
Humerus
Infraspinatus m.
Bursa beneath tendon at this site
Flex elbow (with the brachialis muscle) and extend shoulder. Arises from the supraglenoid tubercle, crosses the shoulder and elbow, and inserts on the radial tuberosity of the radius. It extends the shoulder, and more importantly, with the brachialis muscle, flexes the elbow joint.
Origin- supraglenoid tubercle of the scapula
Insertion- radial tuberosity
Nerve- musculocutaneous
Biceps brachii m.