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Gross Anatomy > Muscle origins, actions and insertions - Thoracic limb > Flashcards

Muscle origins, actions and insertions - Thoracic limb Flashcards

1
Q

Superficial pectoral muscle

A

Origin: Sternum

Insertion: Greater tubercle & cranial hmeral border

Action: Adduct thoracic limb

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2
Q

Deep pectoral muscle

A

Origin: Sternum

Insertion: Greater and lesser tubercles

Action: Adduct thoracic limb and flex shoulder joint

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3
Q

Brachiocephalicus (Cleidobrachialis, Cleidocephalicus)

A

Origin: Clavicular Intersection

Insertion: Cleidobrachialis - distal cranial humerus

Cleidocephalicus :
pars mastoidea - mastoid process

pars cervicalis - dorsal mid-line of the neck

Action: Pull thoracic limb cranially, dpress head pull head and neck laterally

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4
Q

Sternocephalicus

A

Origin: Sternum

Insertion: Mastoid part of temporal bone, occipital bone

Action: Depress head, Draw the head and neck to the side

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5
Q

Sternohyoideus

A

Origin: Sternum

Insertion: Basihyoid bone

Action: Pull the tongue and larynx caudally

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6
Q

Sternothyroideus

A

Origin: Cranial aspect of sternum (manubrium)

Insertion: thyroid cartilage

Action: Draw the tongue and larynx caudally

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7
Q

Omotransversarius

A

Origin: wing of the atlas

Insertion: distal spine of scapula

Action: Pull limb cranially or flex the neck laterally

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8
Q

What is the supraspinous ligament?

A

Connects dorsal aspects of vertebral spines

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9
Q

What is the nuchal ligament?

A

Extends from the spine of the first thoracic to the spine of the axis

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10
Q

Trapezius

A 
Origin: Dorsal neck (cervical) 
Dorsal thoracic (thoracic)

Insertion: Spine of the scapula

Action: Elevate the forelimb

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11
Q

Rhomboideus

A

Origin:
Capitis - Nuchal crest

Cervicis - Dorsal neck

Thoracis - Dorsal thorax

Insertion: Dorsal border of scapula

Action: Elevate the forelimb

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12
Q

Latissimus dorsi

A

Origin: thoracolumbar fascia

Insertion: Teres major tuberosity

Action: Draw the limb caudally, flex or extend the humeral joint

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13
Q

Serratus ventralis (cervicis, thoracis)

A

Origin:
Cervicis - cervical vertebrae

Thoracis - thoracic wall (ribs)

Insertion: Serrated face of scapula

Action: Support/elevate the trunk

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14
Q

Deltoideus

A

Origin: The spine of the scapula and acromion

Insertion: Deltoid tuberosity

Action: Flex the humeral joint

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15
Q

Infraspinatus

A

Origin: Infraspinous fossa

Insertion: greater tubercle

Action: Flex humeral joint, abduct limb at humeral joint, lateral collateral ligament for scapula

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16
Q

Teres minor (ID only)

A

Origin: caudal border of the scapula

Insertion: Teres minor tuberosity

Action: Flex shoulder joint, rotate shoulder laterally, prevent medial rotation when weight bearing

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17
Q

Supraspinatus

A

Origin: Supraspinous fossa

Insertion: Greater tubercle

Action: Extend humeral joint

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18
Q

Subscapularis

A

Origin: Subscapular fossa

Insertion: Lesser tubercle

Action: Adduct limb at humeral joint, medial collateral ligament

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19
Q

Teres major

A

Origin: caudal border of the scapula

Insertion: Teres major tuberosity

Action: Flex humeral joint

20
Q

Coracobrachialis

A

Origin: Coracoid process of the scapula

Insertion: Crest of the lesser tubercle

Action: Stabilize humeral joint medially

21
Q

Tensor fasciae antebrachii

A

Origin: Fascia covering the lateral side of the latissimus dorsi

Insertion: Olecranon

Action: Extends the elbow

22
Q

Triceps brachii - long head

A

Origin: Caudal border of the scapula

Insertion: Olecranon tuber

Action: Extends the cubital joint, flex the humeral joint

23
Q

Triceps brachii - lateral head

A

Origin: Proximal hmerus

Insertion: Olecranon tuber

Action: Extend the elbow

24
Q

Triceps brachii - accessory head

A

Origin: Proximal humerus

Insertion: Olecranon tuber

Action: Extends the elbow

25
Q

Triceps brachii - medial head

A

Origin: Proximal humerus

Insertion: Olecranon

Action: Extend the elbow

26
Q

Aconeous (ID only)

A

Origin: Lateral suprachondylar crest

Insertion: olecranon tuber

Action: Extend the elbow

27
Q

Biceps brachii

A

Origin: Supraglenoid tubercle

Insertion: Ulnar and radial tuberosities

Action: Flex the cbital joint, extend the humeral joint

28
Q

Brachialis

A

Origin: Brachialis groove

Insertion: Proximal radius/ulna

Action: Flex the cubital joint

29
Q

Extensor carpi radialis

A

Origin: Lateral epicondyle of humerus

Insertion: dorsal base of metacarpals II and III

Action: Extend the carpal joints

30
Q

Common digital extensor

A

Origin: Lateral epicondyle of the humerus

Insertion: Extensor processes of distal phalanges

Action: Extend carpal and digital joints

31
Q

Lateral digital extensor

A

Origin: Lateral epicondyle of humerus

Insertion: distal phalanges phalanges III, IV, and V

Action: Extend carpal and digital joints and digits III, IV, V

32
Q

Ulnaris Lateralis

A

Origin: Lateral epicondyle of humerus

Insertion: accessory carpal bone and base of 5th metacarpal bone

Action: Flex carpal joints, abduct manus

33
Q

Abductor digiti I longus (ID only)

A

Origin: Body of Ulna

Insertion: Proximal end of metacarpal I

Action: Abduct the first digit, extend carpal joints

34
Q

Pronator teres

A

Origin: Medial epicondyle of humerus

Insertion: Medial border of radius

Action: Weak pronation of manus, weak flexion of cubital joint

35
Q

Supinator (ID only)

A

Origin: Lateral epicondyle of humerus

Insertion: Body of radius

Action: Supination of manus

36
Q

Flexor carpi radialis

A

Origin: Medial epicondyle of humerus

Insertion: Palmar base of metacarpals II and III

Action: Flex the carpal joints

37
Q

Superficial digital flexor

A

Origin: medial epicondyle of humerus

Insertion: Middle phalanges of the digits

Action: Flex carpal joints, metacarpophalangeal and proximal interphalangeal joints

38
Q

Flexor carpi ulnaris - both heads

A

Origin: Medial epicondyle and olecranon

Insertion: Accessory carpal bone

Action: Flex carpal joints

39
Q

Deep digital flexor - Humeral head

A

Origin: Medial epicondyle of humerus

Insertion: Flexor tubercles of distal phalanges

Action: Flex the carpal and digital joints

40
Q

Deep digital flexor - Ulnar head

A

Origin: caudal border of ulna

Insertion: Flexor tubercles of distal phalanges

Action: Flex the carpal and digital joints

41
Q

Deep digital flexor - radial head

A

Origin: medial border of the radius

Insertion: Flexor tubercles on distal phalanges

Action: Flex the carpal and digital joints

42
Q

Pronator quadratus

A

Origin and insertion: Apposed surfaces of the radius and ulna

Action: pronate the manus

43
Q

Interossei

A

Origin: Palmar base of (respective) metacarpal

Insertion: Palmar base of (respective) proximal phalanx and tendon of common DE

Action: Flex and support metacarpophalangeal joint

44
Q

Tensor fasiae antbrachii

A

Origin: Lattissimus dorsi and associated fascia

Insertion: Olecranon tuber

Action: Extend cubital joint and tense deep antebrachial fascia

45
Q

Brachioradialis

A

Origin: Lateral epicondyle of the humerus

Insertion: fascia near the carpus

Action: Flex cubital joint, supinate the manus

Gross Anatomy (28 decks)

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