The skull is composed of 22 bones that aid in the support and movement, and protection of the brain. The frontal bone forms the forehead and the superior part of the eye’s orbit supporting the eyebrows. The parietal bones form the superior and lateral walls of cranium. Temporal bones lie inferior to the parietal bones and meets with the parietal bones to form the squamosal sutures. The occipital bone forms the floor and the back of the wall of the skull.
A)long B)irregular C)short D)flat Feedback: Correct! 3 CORRECT A bone that is cuboidal in shape is a ________________ bone. A)long B)short C)flat D)irregular Feedback: Correct! 7.2 Histology of Osseous Tissue 4 CORRECT Which of the following is a mature bone cell that appears to be responsible for the overall supervision of bone maintenance? A)osteogenic cells B)osteoblasts C)osteocytes D)endosteum cells E)osteoclasts Feedback: Correct!
There are two parts to this ligament; superior and inferior. Superior acromioclavicular ligament this ligament is a quadrilateral band, covering the superior part of the articulation, and extending between the upper part of the lateral end of the clavicle and the adjoining part of the upper surface of the acromion. Inferior Acromioclavicular Ligament This ligament is somewhat thinner than the preceding, it covers the under part of the articulation, and is attached to the adjoining surfaces of the two bones. The coracoacromial ligament runs from the coracoid process and the acromion. The coracoacromial ligament is a strong triangular band, extending between the coracoid process and the acromion.
Outcome 1 Understand anatomy and physiology in relation to moving & positioning individuals. 1.1 Bones and muscles are concerned with the movement of the body. The skeleton is a rigid framework that gives shape and support to the body and is jointed to permit movement. The vertebral column is the basis of the skeleton and consists of a series of bony rings united by inter-vertebral discs of cartilage. All bones give attachment to muscles, which are responsible for 50% of our body weight and also permit movement.
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 axial skeleton includes the skull, spinal column, ribs and sternum. The appendicular skeleton includes all upper and lower extremities, the shoulder girdle and the pelvic girdle. Bones come in four main shapes, long, short, flat and irregular and are composed of webs of collagen fibers reinforced with calcium and phosphorous. The collagen provides flexibility while the minerals provide tensile strength. The axial skeletal makes up the upper structure of the skeletal system.
| 1.1. Quadratus labii superior: Is a broad sheet, the origin of which extends from the side of the nose to the zygomatic bone. Its medial fibers form the angular head, which arises by a pointed extremity from the upper part of the frontal process of the maxilla and passing obliquely downward and lateralward divides into two slips. One of these is inserted into the greater alar cartilage and skin of the nose; the other is prolonged into the lateral part of the upper lip, blending with the infraorbital head and with the Orbicularis oris. The intermediate portion or infraorbital head arises from the lower margin of the orbit immediately above the infraorbital foramen, some of its fibers being attached to the maxilla, others to the zygomatic bone.
Skeletal System * Function of the Skeletal System * Support - framework that supports body and cradles its soft organs * Protection - for delicate organs, heart, lungs, brain * Movement - bones act as levers for muscles * Mineral storage - calcium & phosphate * Blood cell formation – hematopoiesis * Types of Bones * Long Bones - metacarpals, metatarsals, phalanges, humerus, ulna, radius, tibia, fibula * Short Bones - carpals, tarsals * Flat Bones - rib, scapula, skull, sternum * Irregular Bones - vertebrae, some facial bones * Sesamoid – patella * Skeletal Organization 1. Axial Skeleton * skull, ribs, vertebral column 2. Appendicular skeleton - arms, legs, and bones that anchor the limbs to the axial skeleton. * Axial Skeleton 1. Cranium Facial Bones Anterior View Anterior View 2.
The coccyx it attached at the end of the sacrum through a vestigial disc and is also connected to the sacrum with ligaments. There is very limited movement between the coccyx and the sacrum. “The small coccyx consists of three to five (most often four) coccygeal vertebrae that usually begun fusing by the age of 26. The coccyx provides an attachment site for a number of ligaments and for muscle that constricts the anal opening. The first two coccygeal vertebrae have transverse processes and unfused vertebral arches.
THE SKELETAL SYSTEM – BONES AND JOINTS The skeleton consists of axial and appendicular components. The axial skeleton consists of the skull, vertebral column and bones of the thorax, while the appendicular skeleton consists of the pectoral girdle, pelvic girdle, and bones of the upper and lower limbs. You do not have to remember the names of all the bones of the body but you should familiarise yourself with those indicated on the diagrams below. There are different categories of bones: long bones, short bones, flat bones, sesamoid bones and irregular bones. Long bones – The major bones of the arms (humerus, radius, and ulna) and the legs (the femur, tibia, and fibula) are all long bones.