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Download Raymond and Essie - YISS-Anatomy2010-11
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Muscles that we will study in the cat dissection Below are listed the muscles you must be able to identify on the cat lab practical exam following dissection. Completing the chart will help to identify them on your cat as you dissect. You are required to know the origins, insertions and actions of these muscles. To get ready for dissection you should complete the chart including the origins, insertions and actions for each muscle. Also, cut and paste a picture of the dissected muscle onto the chart (find this on the web). This is independent work; while documents will look similar, no two documents should be the same. The chart is due on Wednesday December 1st by class. Also, bring a printed copy for use when we dissect, after Christmas. Go to these websites for information and pictures, you will need to use more than one to get all your information and pictures. http://www.saddleback.edu/faculty/charrison/smmuscles.html http://www.mhhe.com/biosci/ap/cat_dissect/cat_demo/index.html http://bio.bd.psu.edu/cat/Muscular_System/index.htm http://homes.bio.psu.edu/people/faculty/strauss/anatomy/musc/muscular.htm Muscle Biceps brachii Origin Long head: supraglenoid tubercle of the scapula Shorthead: corocoid process of the scapula Insertion Radial tuberosity of the radius Action Flexes arm and forearm, supinates forearm Picture #2 Muscle Biceps femoris Origin Long head: ischial tuberosity Insertion Head of fibula, lateral condyle of tibia Action Flexes and laterally rotates leg at knee Short head: linea aspera Brachialis Anterior humerus Coronoid process of the ulna Flexes forearm External obliques Lower eight ribs Linea alba, aponeurosis of the external abdominal oblique Compresses abdominal contents, assists in flexion and rotation of vertebral column Picture Muscle Gastrocnemius Origin Lateral and medial condyle of the femur Insertion calcaneus Action Plantar flexes the foot Gluteus maximus Posterior sacrum, coccyx ilium, and Iliotibial tract, fluteal tuberosity of femur Extends and laterally rotates hip Gracilis Inferior ramus and body of the pubis Medial surface of tibia Adducts thigh at hip; flexes leg at knee Picture Muscle Infraspinatus Origin Infraspinous fossa of scapula Insertion Greater tubercle of the humerus Action Laterally rotates arm Internal obliques Lumbodorsal fascia, iliac crest Linea alba, aponeurosis of internal oblique Same as external oblique Latissimus dorsi Lumbodorsal fascia via thoracic and lumbar vertebrae, sacrum, ilium Intertuburcular groove of the humerus Extends, adducts, and medially rotates arm Picture Muscle Masseter Origin Zygomatic arch Insertion mandible Action Elevates mandible Pectoantebrachiali s (not found in humans) Manubrium of sternum Fascia of forearm Adducts forelimb Pectoralis major Sternum. Clavicle, and ribs Greater tubercle and along intertubercular groove of the humerus Flexes, medially rotates, and adducts arm Picture Muscle Pectoralis minor Pronator teres Rectus abdominis Origin Ribs 3-5 Medial epicondyle of the humerus Pubic crest and pubic symphysis Insertion Corocoid process of the scapula radius Ribs and xiphoid process Action Depresses and pulls scapula anteriorly Pronates forearm Flexes vertebral column, compresses abdominal contents Picture Muscle Sartorius Origin Anterior superior iliac spine Insertion Medial tibia Action Flexes, laterally rotates thigh; flexes and medially rotates leg at the knee Semitendinosus Ischial tuberosity Medial tibia Extends thigh at hip; flexes and mideally rotates leg at knee Supraspinatus Supraspinous fossa of the scapula Greater tubercle of the humerus Arm abduction Picture Muscle Tensor fasciae latae Origin Anterior superior iliac spine, iliac crest Insertion Iliotibial tract Action Flexes and abducts thigh Teres major Inferior angle of scapula Lesser tubercle of the humerus Adducts, extends, and medially rotates arm Teres minor Lateral border of scapula Greater tubercle of the humerus Laterally rotates arm Picture Muscle Triceps brachii Origin Long head: infraglenoid tubercle of the scapula Lateral head: posterior humerus Medial head: posterior humerus Insertion Olecranon process of the ulna Action Extends arm and forearm Forearm extension Forearm extentsion Xiphihumeralis (not found in humans) Xiphoid process of sternum Proximal end of humerus Adducts forelimb Picture
