The AC joint allows the ability to raise the arm above the head. This joint functions as a pivot point (although technically it is a gliding synovial joint), acting like a strut to help with movement of the scapula resulting in a greater degree of arm rotation. The AC joint is stabilized by 3 ligaments; the acromioclavicular ligament, the coracoacromial ligament, and the coracoclavicular ligament. The acromioclavicular ligament attaches the clavicle to the acromion of the scapula. There are two parts to this ligament; superior and inferior.
Lever; almost always the bone Fulcrum; the pivot point of the lever in which is usually the joint. Muscle force; the force that drives the opposite ends of the muscles together. Resistive force; the force generated by a factor to the external body Torque; the degree in which a force tends to rotate an object. http://www.answers.com/topic/first-class-lever http://www.answers.com/topic/first-class-lever There are three different types of levers in the body; First-class, Second-class and Third-class. First-class; when the muscle force and resistive force is on different sides of the fulcrum e.g.
The main action of the foot is to assist in shock absorption and propel the body across the plane. OKC and CKC are vital in the assessment of both structural and functional characteristics of the foot. In close evaluation of Cameron’s functional and structural foot type the following clinically significant findings were known; Talar head palpation traverse for the rearfoot, frontal inversion of the calcaneus, traverse bulge of the forefoot in the region of the TNJ, flexible range of motion, subtalar joint (STJ), flexible first ray range of motion, loose mid tarsal joint (MTJ), and forefoot valgus due to size being small. A functional deformity can be seen in an open kinetic chain (OKC), non-weight bearing position, rather than a structural deformity. On assessment of Cameron’s OKC results it was determined that his STJ assessment indicated a loose quality of motion bilaterally due to his being hypermobile.
The articular capsule has two layers: -Fibrous capsule: the outer layer - Synovial membrane: the inner layer that secretes synovial fluid which lubricates to reduce friction. The surface of the knee joint, the patella lies within the joint capsule and has an important function which is to reduce friction during extension and to protect the knee joint. The muscles that facilitate the movement of the synovial joints are skeletal muscles. The muscles that move the knee joint are called quadriceps and hamstring. When the agonist which is the contracting muscle which, in this case is the quadriceps, it allows flexion of the knee joint while the antagonist which will be the hamstring, is the relaxed
The effect of orofacial musculature on complete denture 1.The Muscles of the Quadratus labii superioris. | | Quadratus labii inferioris. | Caninus. | | Triangularis. | Zygomaticus.
There are three joints of the thumb carpometacarpal, interphalangeal, and metacarpophalangeal. The CMC and the IP joints allow for thumb mobility while the MCP joint provides stability (Clin). Ligaments and tendons connect these joints. At the MCP joint there are two major ligaments on either side of it, the radial collateral ligament and the ulnar collateral ligament. In anatomical position the RCL is on the lateral side of the thumb while the UCL is on the medial side of the thumb.
Turn the wing upside down and bend the joints. Again pull on each muscle and note how the bones move. Locate the nerve and blood vessels along the biceps muscle. Locate where the biceps muscle attaches to the bones. Pull on the muscle again and try to recognize what is happening to the bones.
Briefly explain what is meant by Proprioceptive Neuromuscular Facilitation (PNF) stretching. 11. Describe a flexibility/warm-up exercises that are considered to be potentially dangerous to the knee joint. Explain why the exercise is considered to be potentially harmful to the knee joint. 12.
Then, bend your back, knees pull the head, and at the same time bend your neck so that your face is as close to the knees (Figure 2). When you come to this position, begin to straighten your legs back returning to the position as shown in Figure 1. Repeat 8 times. Exercise 8th Kneel on the floor and place the ball in front of you. Rest your hands on the ball and lean body forward, so that a large part of the body weight falls on the hands (Figure 1).
In terms of structure, the humerus serves as a connection between the scapula and the elbow, where it links to the two lower arm bones. The humerus bone of the upper arm (the arm in anatomy refers only to the top part of the upper limb i.e. between the elbow and the shoulder). Like all bones it gives shape to the body and