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Muscle/Tendon/Ligament List General Location Name Neck Brachiocephalicus Neck Obliquus Capitis Cranialis Raynor page Grönberg Higgins reference page page unless noted reference reference otherwise 120-1,144 84 38, 39 Origin or Attachment 55 temporal bone Ventral surface of NA Wyche p109 wing of atlas Innervation Action humerus two parts: ventral branch of accessory nerve and axillary nerve To move head and neck to the side. When head and neck are fixed, it's the primary forward mover of the foreleg. Extends shoulder and raises and pulls shoulder forward. Nuchal crest of occipital bone, mastoid process of temporal bone Bilateral action: extends the Dorsal branch of head. Unilateral action: flexes cervical nerve 1 head laterally occipital bone Elevates head, flexes head, bends head laterally depending cervical nerve 1 on which part of the muscle group is active. Neck Rectus Capitus group 83 Neck Longissimus capitis 86 63 C 3-7, T 1-2 Mastoid process of temporal bone Dorsal branches Bilateral Action: Elevates head of cervical and neck. Unilateral action: nerves bends head laterally. Neck Longissimus atlantus 86 63 C 3-7, T 1-2 Wing of atlas Dorsal branches Bilateral Action: flexes neck. of cervical Unilateral action: bends neck nerves laterally. 85 38, 42, 64 Nuchal ligament, thoracolumbar fascia, 57 spinous processes of T 3-5 Nuchal crest of occipital bone, mastoid process of temporal bone, transverse processes of C 3-5 Bilateral action: extends neck Dorsal branches and elevates head. Unilateral of cervical action: flexes head and neck nerves laterally. 60,61 58 45 44 various locations 63 along spinal column Neck Splenius Neck/Thoraci Nuchal/Supraspinous ligament Longissimus group Neck/Thoraci (cervical, thoracic, lumbar) Level One Equine Anatomy Section 3 Introduction Avalon Performance Horse and Rider Support 98-9 NA Wyche p109 atlas and axis Insertion or Attachment Nuchal: occiput, Nuchal: withers, n/a Supraspinous: withers Supraspinous: sacrum various locations along spinal column Acts as a suspension bridge along the topline Extends back and neck, Dorsal branches stabilizes vertebral column. of spinal nerves Acting singularly it flexes the spine laterally. 3/22/2013 1 of 5 Muscle/Tendon/Ligament List General Location Name Raynor page Grönberg Higgins reference page page unless noted reference reference otherwise Ventral Serrated Neck/Thoraci group (thoracic and cervical) Neck/Thoraci Trapezius 125 123 46 55, 57 Serrated surface of Transverse processes scapula, scapular of C 3-7 cartilage Innervation Action Ventral branches of cervical nerves Part of thoracic sling. Raises neck when limb is fixed, (aids in inspiration). 55 Radial tuberosity, medial collateral Extends shoulder joint, flexes ligament of elbow Musculocutaneo 59 Supraglenoid tubercle elbow joint, supports shoulder joint, and radial carpal us nerve joint cranially. extensor muscle via lacertus fibrosus Biceps Brachii 135 61 Forelimb Deltoid 129 38-9 55 Forelimb Extensor Carpi Radialis 136 39, 44, 61 59 Forelimb Flexor Carpi Ulnaris 142 NA Forelimb Infraspinatus 129 37, 44 Forelimb Supraspinatus 128 61 Forelimb Triceps Brachii group 133 61 Avalon Performance Horse and Rider Support Insertion or Attachment Cervical part draws scapula cranially and abducts it. Nuchal ligament, and 1. Spine of scapula 2. Dorsal branch of 55 supraspinous ligament Proximal third of spine Thoracic part draws scapula accessory nerve caudally and abducts it. Entire of C 2- T 10 of scapula muscle elevates the shoulder. Forelimb Level One Equine Anatomy Section 3 Introduction Origin or Attachment Caudal border of spine Deltoid tuberosity of humerus of scapula Axillary nerve Proximodorsal surface Lateral supracondylar of third metacarpal Radial nerve crest of humerus bone 1. Medial epicondyle 59 of humerus 2. Ulna, Accessory carpal bone Ulnar nerve medial olecranon 57 Extends carpus and flexes elbow joint Flexes carpus Suprascapular nerve Flexes shoulder joint and supports it laterally. Abducts the forearm. Greater and lesser tubercle of humerus Suprascapular nerve Extends and supports shoulder joint Ulna, olecranon Radial nerve Flexes shoulder joint and extends elbow joint Infraspinous fossa and Greater tubercle of spine of scapula humerus Supraspinous fossa and spine of scapula Medial surface of 57 middle third of humerus 57 Flexes shoulder joint and abducts the forearm 3/22/2013 2 of 5 Muscle/Tendon/Ligament List General Location Lower Limbs Name Raynor page Grönberg Higgins reference page page unless noted reference reference otherwise Deep digital flexor muscle and tendon Superficial digital Lower Limbs flexor muscle and tendon Suspensory Ligament Lower Limbs (also called interosseus muscle) 120, 166 120, 140 56, 61-2 56, 61-2 Origin or Attachment 1. Medial epicondyle of humerus 2. Ulna, 59, 69 medial olecranon 3. Caudal surface of middle of radius. Caudal surface of radius below its middle (check 69 ligament). Medial epicondyle of humerus. 74 59 top back of cannon 10 bone Thoracic Internal and External 09, 112, 114 Intercostals 38 59 Refer to book Thoracic Latissimus Dorsi 124 38-9, 44 Thoracic Pectoral group Thoracic Rhomboideus Abdomen Adbominal group Level One Equine Anatomy Section 3 Introduction Avalon Performance Horse and Rider Support 126-7 45-6 123 37, 42 115 45 55, 64 Thoracolumbar fascia 65, 67 Numerous, refer to book Nuchal ligament, 59 dorsoscapular ligament Insertion or Attachment Flexor tuberosity of distal phalanx Innervation Action Ulnar and median nerves Flexes digit and carpus Extremity of proximal phalanx. Proximal Ulnar nerve extremity of middle phalanx. Flexes digit and carpus four branches attach to: sesamoid bones and common digital extensor tendon n/a Support and stabilize the fetlock Refer to book Refer to book Aid in inspiration and expiration Humerus, teres major Thoracodorsal tuberosity nerve Flexes shoulder joint and draws humerus inwards Numerous, refer to book Part of thoracic sling. Superficial and transverse pectoral: attaches limb to Numerous, refer trunk, adducts and advances forelimb. Deep pectoral: to book supports trunk, adducts limb and draws it caudally, stabilizes shoulder joint. Scapular cartilage Ventral Adducts and draws shoulder branches of 6-7 dorsally and elevates neck cervical nerves Ventral various locations, see various locations, see branches of 61, 63 book book intercostal and lumbar nerves Supports abdominal viscera, aids in defecation and parturition, aids in expiration and flexes back, pulls pelvis closer to sternum 3/22/2013 3 of 5 Muscle/Tendon/Ligament List General Location Name Hindlimb Sacrotuberal Ligament Raynor page Grönberg Higgins reference page page unless noted reference reference otherwise Masterson p109, Wyche Sacrum p24, 114 Hindlimb Biceps Femoris 154 38-9, 42, 44 Hindlimb Gastrocnemius group 163 Hindlimb Gluteal group Hindlimb Gracilis Hindlimb Long Digital Extensor Level One Equine Anatomy Section 3 Introduction Avalon Performance Horse and Rider Support Origin or Attachment 37 Vertebral part: spinous and transverse processes of Cd 3-5, broad 55 sacrotuberous ligament, caudal fascia. Pelvic part: ischial tuberosity Lateral and medial 57 supracondylar tuberosities of femur Lumbar part of longissimus dorsi muscle, gluteal surface of ilium, 55, 57 sacrum, sacroiliac, ligament, broad sacrotuberous ligament Insertion or Attachment Innervation Ischium of pelvis Structural support for hind-end Patella, intermediate and lateral patellar ligaments. Cranial Caudal gluteal border of tibia, crural nerve and tibial fascia, common nerve calcaneal tendon, and tuberosity of calcaneus Part of hamstrings. Cranial part: extends hip and stifle joints, abducts limb. Caudal part: flexes stifle and abducts limb, extends tarsal joint Tuberosity of calcaneus Tibial nerve Flexes stifle joint and extends tarsal joint Greater trochanter Cranial gluteal nerve Extends hip and abducts the hindlimb 149-150 37 156 39 57 38 Primarily extensor process of distal Lateral condyle of phalanx. Secondarily 55 Peroneal nerve femur, extensor fossa extensor processes of middle and proximal phalanx 162 Pelvic symphysis, symphysial tendon Action Crural fascia, medial patellar ligament, Obturator nerve Adducts the hindlimb cranial border of tibia Extends digit and flexes tarsal joint 3/22/2013 4 of 5 Muscle/Tendon/Ligament List General Location Hindlimb Hindlimb Hindlimb Hindlimb Hindlimb Name Raynor page Grönberg Higgins reference page page unless noted reference reference otherwise Quadriceps group (rectus femoris and vastus lateralis, medialis, intermedius) Semitendinosis Tensor fascia latae Psoas group Semimembranosus 159 155 158 148 156 Book references: Grönberg, ABC of the Horse Atlas, 2011 Masterson, Beyond Horse Massage, 2011 Raynor, The Horse Anatomy Workbook, 2006 Wyche, The Horse's Muscles in Motion, 2002 Level One Equine Anatomy Section 3 Introduction Avalon Performance Horse and Rider Support Origin or Attachment Insertion or Attachment Innervation Action 37, 43 Attaches on patella by tendon of quadriceps Rectus femoris: ilium. and continues as 57 Vastus lateralis: Femoral nerve intermediate patellar femur. ligament attaching on tibia. Rectus femoris: flexes hip, extends stifle, stabilizes patella. Vastus lateralis: extends stifle, stabilizes patella. 39, 44 Vertebral part: last sacral vertebra, transverse processes of Cd 1-2, caudal 59 fascia, broad sacrotuberous ligament. Pelvic part: ventral part of ischial tuberosity Cranial border of tibia, crural fascia, with tarsal ligament to tuberosity of calcaneus Nervus ischiadicus caudal gluteal nerve Part of hamstrings. During weight-bearing, extends hip, stifle, and tarsal joints. When limb is not burdened, flexes stifle joint, draws limb backward and rotates it inward 55 Tuber coxae Fascia lata of patella, lateral patellar ligament. Cranial Cranial gluteal border of tibia, third nerve trochanter (together with superficial gluteal muscle). Flexes hip, extends stifle, tenses fascia lata of femur and draws limb forward Ventral branches of intercostal and lumbar nerves Flexes hip, draws limb forward, and rotates thigh outward 38, 43 45 39 Ribs 17-18, ventral surface of bodies and 59 Lesser trochanter transverse processes of lumbar vertebrae 59 Multiple origins see text Medial condyles of femur and tibia Part of hamstrings. During weight-bearing, extends hip Tibial nerve and and adducts the limb. When caudal gluteal limb is not burdened, adducts nerve and draws limb backward and rotates it inward. Notes: 1. Muscle, tendon and ligament names vary between anatomical books, but will be generally similar 2. Many muscles are actually groups of muscles with different origin or insertion points 3. There are muscle groups like serratus and longissimus that occur in different locations along the spinal column with words like cervical or thoracic included in the name to distinguish location. 3/22/2013 5 of 5