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Questions and Answers

List the five main veins in the canine.

Accessory v., cephalic v., median v. , median cubital v, and brachial v.

Match to correct vein drainage

Accessory cephalic v. = Drains into cephalic Cephalic v. = External jugular Median v. = Drains into both median cubital and brachial b. Free bee = Free bee

How many branches branch off the axillary artery in the canine?

  • 1
  • 3
  • 4 (correct)
  • 5

    • What does the external thoracic artery supply?

    <p>Superficial pectoral</p> Signup and view all the answers

    What does the lateral thoracic artery supply? Select all that apply

    <p>Latissimus dorsi</p> Signup and view all the answers

    What are the two branches of the subscapular artery?

    <p>The two branches are the Thoracodorsal artery and the caudal circumflex humeral artery.</p> Signup and view all the answers

    What does the Thoracodorsal artery supply? (Select all that apply)

    <p>Teres major</p> Signup and view all the answers

    What does the caudal circumflex humeral artery supply? (Select all that apply)

    <p>Muscles of shoulder</p> Signup and view all the answers

    What does the cranial circumflex humeral artery supply?

    <p>Cranial aspect of shoulder</p> Signup and view all the answers

    List the branches of the Brachal artery in correct order

    <p>Deep brachial a., bicipital a. , collateral ulnar a., transverse cubital a., common interosseous a.</p> Signup and view all the answers

    What does the deep brachial artery supply?

    <p>Triceps brachii</p> Signup and view all the answers

    What does the bicipital artery supply?

    <p>Biceps brachii muscle</p> Signup and view all the answers

    What does the collateral ulnar artery supply?

    <p>Caudal elbow</p> Signup and view all the answers

    What does the transverse cubital artery supply?

    <p>Cranial elbow</p> Signup and view all the answers

    What does the common interosseous artery supply?

    <p>It has three branches that supply the antebrachium</p> Signup and view all the answers

    Which artery signifies the end of the brachial artery and the beginning of the median artery?

    <p>Common interosseous a.</p> Signup and view all the answers

    Put these arteries in order: subclavian, brachial, axillary, median.

    <p>Subclavian, axillary, brachial, median.</p> Signup and view all the answers

    What would happen if you blocked the axillary nerve?

    <p>You would not be able to flex the shoulder, i.e., deltoideus, teres major, and teres minor.</p> Signup and view all the answers

    Which artery offers principal blood supply to the manus?

    <p>Median a.</p> Signup and view all the answers

    Which nerve innervates the flexors of the manus and the pronator teres and quadratus?

    <p>Median n.</p> Signup and view all the answers

    What are the three branches of the subscapular artery and what is the subscapular artery a branch off of?

    <p>Thoracodorsal, subscapular, and caudal circumflex humeral; brachial artery.</p> Signup and view all the answers

    What nerve innervates the latissimus dorsi and what artery supplies blood to it?

    <p>Thoracodorsal a and n.</p> Signup and view all the answers

    Which nerve is responsible for the panniculus reflex and what muscle is it innervating?

    <p>Lateral thoracic n.; Cutaneous trunci.</p> Signup and view all the answers

    Which nerve and artery run close to the prescapular lymph node?

    <p>Lateral thoracic n. and artery.</p> Signup and view all the answers

    What spinal nerves make up the brachial plexus?

    <p>C6-T2.</p> Signup and view all the answers

    What bony prominence protects the suprascapular nerve in the dog?

    <p>Acromion.</p> Signup and view all the answers

    Which nerve innervates the triceps brachii?

    <p>Radial n.</p> Signup and view all the answers

    Can a dog put weight on a limb that has had its radial nerve cut in the brachial plexus?

    <p>False</p> Signup and view all the answers

    Which nerve(s) supply sensory innervation to the palmar aspect of the paw?

    <p>Median n.</p> Signup and view all the answers

    Which nerves innervate the humero radioulnar joint? (Sensory or motor?)

    <p>Median, ulnar, musculocutaneous, radial.</p> Signup and view all the answers

    Which nerve allows a dog to feel a pin prick in its dorsal manus?

    <p>Radial n.</p> Signup and view all the answers

    Which two muscles will you find the axillary nerve in between?

    <p>Subscapular and teres major muscle.</p> Signup and view all the answers

    Which nerve will innervate the coracobrachialis, and what other muscles will it innervate?

    <p>Musculocutaneous n. (biceps brachii and brachialis).</p> Signup and view all the answers

    Which artery signifies the end of the brachial artery and the beginning of the median artery?

    <p>Common interosseous.</p> Signup and view all the answers

    The caudal pectoral nerve innervates the superficial pectoral muscles.

    <p>False</p> Signup and view all the answers

    What muscle does the suprascapular nerve innervate?

    <p>Supraspinatus muscle</p> Signup and view all the answers

    Which nerve runs near the medial epicondyle and olecranon?

    <p>Ulnar nerve</p> Signup and view all the answers

    Which nerve is responsible for the innervation of the latissimus dorsi muscle?

    <p>Thoracodorsal nerve</p> Signup and view all the answers

    What action is primarily facilitated by the musculocutaneous nerve?

    <p>Flexion of the elbow</p> Signup and view all the answers

    Which nerve branches with the median nerve and is associated with flexing the carpus and digits?

    <p>Ulnar nerve</p> Signup and view all the answers

    Where does the radial nerve provide somatic sensory innervation in the forelimb of the canine?

    <p>Dorsal manus, and the skin of the lateral and cranial antebrachium</p> Signup and view all the answers

    Which muscle(s) does the radial nerve provide somatic motor innervation to?

    <p>ECLU mm.</p> Signup and view all the answers

    What muscles does the radial nerve provide somatic motor innervation to?

    <p>ECLU muscles, tensor fascia antebrachi, triceps brachii, aconeus, and supinator mm.</p> Signup and view all the answers

    The thoracodorsal nerve provides sensory function to the ventral aspect of the thorax and abdomen

    <p>False</p> Signup and view all the answers

    What nerve provides sensory function to the lateral shoulder?

    <p>Axillary nerve</p> Signup and view all the answers

    The suprascapular nerve provides sensory innervation to the glenohumeral joint

    <p>True</p> Signup and view all the answers

    Study Notes

    Nerve and Artery Order

    • Order of arteries: subclavian, axillary, brachial, median.

    Impact of Axillary Nerve Blockage

    • Blocking the axillary nerve prevents shoulder flexion, affecting the deltoideus, teres major, and teres minor muscles.

    Blood Supply to the Manus

    • The median artery serves as the principal blood supply to the manus.

    Nerve Innervation for Flexors and Pronators

    • The median nerve innervates the flexors of the manus, including the pronator teres and pronator quadratus.

    Subscapular Artery Branches and Origin

    • The subscapular artery has three branches: thoracodorsal, subscapular, and caudal circumflex humeral. It branches off the brachial artery.

    Innervation and Blood Supply for Latissimus Dorsi

    • The thoracodorsal nerve innervates the latissimus dorsi muscle, which receives blood supply from the thoracodorsal artery.

    Panniculus Reflex

    • The lateral thoracic nerve is responsible for the panniculus reflex, innervating the cutaneous trunci muscle.

    Nerve and Artery Near Prescapular Lymph Node

    • The lateral thoracic nerve and artery run close to the prescapular lymph node; however, the artery predominantly supplies the deep pectoral muscle.

    Brachial Plexus Composition

    • The brachial plexus is formed from the ventral branches of spinal nerves C6 to T2.

    Protection of Suprascapular Nerve

    • The acromion bony prominence protects the suprascapular nerve in dogs.

    Triceps Brachii Innervation

    • The radial nerve innervates the triceps brachii muscle.

    Weight Bearing After Radial Nerve Injury

    • After a radial nerve cut in the brachial plexus, a dog cannot bear weight on the affected limb.

    Sensory Innervation to the Palmar Paw

    • The median nerve supplies sensory innervation to the palmar aspect of the paw.

    Innervation of Humeroulnar Joint

    • The median, ulnar, musculocutaneous, and radial nerves innervate the humeroradioulnar joint, providing both sensory and motor functions.

    Dorsal Manus Sensation

    • The radial nerve enables a dog to perceive a pin prick on its dorsal manus.

    Axillary Nerve Muscle Association

    • The axillary nerve is situated between the subscapular muscle and the teres major muscle.

    Coracobrachialis Innervation

    • The musculocutaneous nerve innervates the coracobrachialis muscle, as well as the biceps brachii and brachialis muscles.

    Transition from Brachial to Median Artery

    • The common interosseous artery indicates the transition from the brachial artery to the median artery, also supplying the pronator quadratus.

    Caudal Pectoral Nerve Functionality

    • False assertion: the caudal pectoral nerve innervates the deep pectoral muscle, not the superficial pectoral muscles.

    Cranial and Caudal Pectoral Nerves

    • Cranial pectoral nerves innervate the superficial pectoral muscle.
    • Caudal pectoral nerves provide innervation to the deep pectoral muscle.

    Lateral Thoracic Nerve

    • Supplies the cutaneous trunci muscle.
    • Located adjacent to the axillary lymph node.

    Suprascapular Nerve

    • Positioned between the supraspinatus and subscapularis muscles.
    • Responsible for the innervation of the muscles in this region.

    Subscapular Nerve

    • Directly innervates the subscapularis muscle.
    • Plays a role in shoulder movements.

    Musculocutaneous Nerve

    • Primarily innervates the brachialis muscle.
    • Involved in flexion at the elbow joint.

    Axillary Nerve

    • Provides motor function to teres major and subscapularis muscles.
    • Responsible for shoulder flexion.

    Thoracodorsal Nerve

    • Innervates the latissimus dorsi muscle.
    • Important for shoulder extension and retraction.

    Radial Nerve

    • Innervates the triceps brachii muscle.
    • Located near the deep brachial artery, involved in extending the elbow.

    Median Nerve

    • Runs alongside the median artery and vein.
    • Responsible for flexing the carpus and digits.

    Ulnar Nerve

    • Found between the medial epicondyle and olecranon.
    • Facilitates flexion of the carpus and digits, branches with the median nerve for combined function.

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