What Is Semitendinosus?

Triceps Brachii - It's attachments are the Olecranon process, posterior humerus shaft, and infraglenoid tuberical. When it contracts it causes extention.

Descriptive terms are used to name skeletal muscles. Some names give the location in the body. The temporalis muscle is attached to the temporal bone in the skull. The brachialis muscle is attached to the humerus bone, but brachial refers to the main artery in the arm. Some muscles are named for their origins and insertions, like the genioglossus muscle, for example, originates at the chin (geneion) and inserts in the tongue (glossus). Some muscles are named for the arrangement of the fascicle groups. For example the rectus abdominus is the straight muscle that is in the adbominus.

As explained by Opar (3) the hamstring consists of three muscles, biceps femoris (BF), semitendinosus (ST) semimembranosus (SM), this composes a muscle group crossing the hip and knee joint that acts synergistically in extending the hip and flexing the knee.

The major muscle groups consist of the upper body, Rotator cuff muscle, Upper arm, Quadriceps, Hamstring group, Lower leg and Midsection. The Upper Body consists of the Trapezious muscle which Orgin is located near the base of skull, occipital protuberance and posterior ligaments of neck. The middle spinous process of 7c and T1 - T3. The lower spinous process of T4-T12. The insertion of the upper Trapezius is located in the posterial aspect of the lateral clavicle. The middle Trapezius is located in the medial border

vastus medialis. Collectively the quadriceps muscle is the biggest in the human body and its purpose is to expand the knee. The specific task of the vastus lateralis muscle is to extend the lower leg and allow the body to rise up from a squatting position.(Hannan et al, 2000).

These muscles begin at the ischial tuberosity, which is at the bottom of the pelvis. The muscles meet at the knee joint and end at the lower leg, where they are joined together through connective tissue that attach the tendons to the bones like double-sided tape. The hamstring muscle groups work to help extend the leg back and provide motion at the knee. Due to the crossing

The quads include the rectus femoris, and the vastus lateralis, intermedius, and medialis. This muscle group shares a common tendon at insertion. The patellar tendon inserts at the tibial tuberosity, and within this tendon lies the patella. The patella is anterior to the femur-tibia articulation, and this sesmoid bone increases the leverage of the quads by acting as a pulley. The major contributor to the stability of the knee joint is the strength of the quads. The only muscle that assists in extension is the tensor fascia lata.

The largest joint in the horses is the stifle joint in the hind legs. This joint is a lot like the knee in us, humans. The lower Femur, upper tibia and patella (knee cap) are the bones that make up the joint. Sitting between the femur and tibia is the semilunar cartilages(menisci)this helps with shock absorption and helps keep the joint positioned correctly. The Patella sits on the trochlea a track like structure that sits on the lower end of the femur. This structure purpose is to reduce friction and to transmit extension power from the femur down to the tibia. The quadriceps femoris is the main extensor of the stifle and, runs along the front of the femur connecting to the patella. Three patellar ligaments(middle patellar, medial patellar

The iliopsoas is actually two muscles, the psoas major and the iliacus. They originate in different areas, but come together to form a tendon, hence why they are commonly referred to as one muscle. Unlike many of the anterior thigh muscles, the iliopsoas does not extend the leg at the knee joint.The psoas major originates from the lumbar vertebrae, and the iliacus originates from the iliac fossa of the pelvis. They insert together onto the lesser trochanter of the femur.The iliopsoas flexes the lower limb at the hip joint and assists in lateral rotation at the hip joint.The psoas major is innervated by anterior rami of L1-3, while the iliacus is innervated by the femoral nerve.The quadriceps femoris consists of four individual muscles; three

Proximally, (VM) attaches to the proximal femur. Starting at the intertrochanteric line and moving posteroinferiorly to the medial supracondylar line (having passed over the pectineal line and the medial lip of the linear aspera (Drake et al 2013)). Distally the VM attaches to the medial boarder of the patella bone over the knee joint.

Hip flexors (Psoas major, rectus femoris, sartorius, tensor fasciae latae, pectineus, adductor longus, adductor brevis, gracilis)

This is the only muscle that is on the lateral thigh. It lies next to one of the hamstrings and the biceps femoris. Even though it is deep, you can easily feel the fibers. The action is extension of the knee. The origin is the lateral lip of the linea aspera, gluteal tuberosity, and greater trochanter. The insertion is the tibial tuberosity (via the patella and patellar ligament)(Andrew Biel, 2014).

Teres major: -Axillary border of scapula near inferior angle -Crest below lesser tubercle nest to latismus dorsi attachment Shoulder extention , abduction and medial rotation Teres minor -Axillary border of scapula - Greater tuberosity of humerus - shoulder lateral roattion , horizontal abduction Infraspinatus Infraspianous fossa of scapula - Greater tuberosity of humerus Shoulder lateral rotation, horizontal abduction Supraspinatus Supraspinous fossa of scapula Greater tubercle of humerus Upper trapezius Occipital bone, nuchal ligament on cervical spinous processes Outer 3rd of clavicle, acromion process Scapular elevation and upward rotation Middle trapezius Spinous processes of C7 through T3 Scapular spine Scapular retraction Lower trapezius Spinous processes of middle and lower thoracic vertebrae Base

The shoulder is a ball and socket joint which allows it a flexion and extension motion.

Origin: soleal line and middle third of posterior border of tibia and upper quarter of posterior shaft of fibula including neck