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Skeletal System. Introduction. The framework of bones and cartilage that protects our organs and allows us to move is called the skeletal system.

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Introduction
Introduction

  • The framework of bones and cartilage that protects our organs and allows us to move is called the skeletal system.

  • The branch of medicine that deals with the preservation and restoration of the skeletal system, articulations (joints), and associated structures is called orthopaedics.


The skeletal system performs the following functions
The skeletal system performs the following functions:

  • Support

  • Protection (for internal organs)

  • Movement

  • Mineral storage

  • Storage of blood cell-producing cells

  • Storage of energy


Types of bones
Types of Bones

There are five principal types of bones based on shape

1. Long bones (e.g. thighs, legs, toes, arms, forearms, and fingers)

  • greater length than width

  • consist of a shaft and extremities (ends)

  • slightly curved for strength

  • consist mostly of compact bone (dense bone with few spaces) but also contain considerable amounts of spongy bone (bone with large spaces)


2 short bones e g wrist ankle bones
2. Short bones (e.g. wrist, ankle bones)

  • Somewhat cube-shaped and nearly equal in length and width

  • Spongy except at the surface where there is a thin layer of compact bone


3 flat bones e g cranial bones sternum ribs scapulas
3.Flat bones (e.g. cranial bones, sternum, ribs, scapulas)

  • Generally thin and composed of two more or less parallel plates of compact bone enclosing a layer of spongy bone

  • Flat bones afford considerable protection and provide extensive areas for muscle attachment


Irregular bones e g vertebrae and certain facial bones
Irregular bones (e.g. vertebrae, and certain facial bones)

  • Have complex shapes and cannot be grouped into any of the other three categories

  • They vary in the amount of spongy and compact bone


5 sesamoid bones
5.Sesamoid bones

  • Are small bones in tendons where considerable pressure develops, for instance, the wrist

  • Their number varies greatly from person to person

  • All people have at least two sesamoid bones: the patella (kneecap)


Divisions of the skeletal system
Divisions of the Skeletal System

  • The adult human skeleton consists of 206 bones grouped as the axial skeleton and the appendicular skeleton.

  • The axial division consists of the bones of the skull, auditory ossicles, hyoid bone, ribs, breastbone, and the backbone.

  • The appendicular division consists of the bones of the upper and lower extremities (limbs), plus the bones called girdles, which connect the extremities to the axial skeleton.

  • There are 80 bones in the axial division and 126 in the appendicular. Listed below are the divisions of the skeletal system.


Anatomical position ap
Anatomical Position (AP)

AP is the reference position used to describe the location of anatomical parts and to describe and explain human movement.

The subject is:

  • standing upright with feet flat on the floor

  • arms at the side of the body

  • facing the observer

  • palms are facing forward (supinated)



Directional terms
Directional Terms

Note: the midline is an imaginary vertical line that divides the body into equal left and right sides

Superior: nearer the head

  • e.g. the heart is superior to the liver

    Inferior: farther away from the head

  • e.g. the stomach is inferior to the lungs


Directional terms1
Directional Terms

Anterior (ventral): nearer to or in front of the body

  • e.g. the sternum is anterior to the heart

    Posterior (dorsal): nearer to or at the back of the body

  • e.g. the esophagus is posterior to the trachea


Directional terms2
Directional Terms

Medial: closer to the midline of the body

  • e.g. the ulna is on the medial side of the forearm

    Lateral: farther away from the midline of the body

  • e.g. the ear is lateral to the nose in all individuals


Directional terms3
Directional Terms

Proximal: nearer to the attachment of an extremity (limb) to

  • the trunk; nearer to the point of origin

  • e.g. the humerus is proximal to the radius

    Distal: farther from the attachment of an extremity (limb) to the

  • trunk; farther away from the point of origin

  • e.g. the phalanges are distal to the carpals (wrist bones)


Directional terms4
Directional Terms

Superficial: on or near the surface of the body

  • e.g. the skin is the most superficial organ of the body

    Deep: farther away from the surface of the body

  • e.g. the ribs are deep to the skin of the chest


Planes of motion and axes
Planes of Motion and Axes

  • Biomechanics is the study of human movements through the use of physics. As such, biomechanics has its own language and terminology. The language of biomechanics establishes a common reference system of standard terms. Planes and axes of motion are an important part of this language.


Planes of motion
Planes of Motion

A plane of motion can be defined as the two dimensional space cut by a moving body or the plane along which movements occur. There are generally three planes used to describe segmental and body movements in physical activity. These are:

Sagittal plane

  • a vertical plane that cuts the body into right and left sides

    Frontal plane

  • vertical plane that cuts the body into anterior (front) and posterior (back) parts

    Transverse plane

  • horizontal plane that cuts the body into superior and inferior parts



Anatomical axes
Anatomical Axes

An axis is the point about which rotation of a body or of a body segment occurs. There are three axes of rotation. Each axis is associated with a plane of motion and the axis is perpendicular to that plane.

Horizontal axis (…think East and West)

  • passes through the body from side to side

  • perpendicular to the sagittal plane

    Antereoposterior axis (axis)

  • passes through the body from front to back

  • perpendicular to the frontal plane

    Longitudinal axis (…think North and South pole)

  • passes through the body from top to bottom

  • perpendicular to the transverse plane


Planes movements
Planes & Movements

Movements in the sagittal plane around a horizontal axis

  • (e.g. front roll, back roll, cycling, running)

    Flexion

  • flexion at a joint results in a decrease of the angle between the two segments that meet at that joint

    Extension

  • extension at a joint results in an increase of the angle between the two segments that meet at that joint

  • if the movement occurs beyond the extended position, the action is called hyperextension


Examples of flexion and extension
Examples of flexion and extension

  • shoulder flexion and extension

  • elbow flexion and extension

  • wrist flexion and extension

  • fingers flexion and extension

  • hip flexion and extension

  • knee flexion and extension

  • ankle dorsi flexion and plantar flexion

  • tilt of pelvis under

  • Dorsi flexion: bringing the toes toward the shin

  • Plantar flexion: pointing the toes away from the shin (toward the floor)


Planes movements1
Planes & Movements

Movements in the frontal plane around a antereoposterior axis

  • (e.g. cartwheel, jumping jacks, galloping)

    Abduction

  • occurs when a body part is moved away from the midline of the body

  • e.g. shoulder, hip, fingers

    Adduction

  • occurs when a body part is moved toward the midline of the body

  • e.g. shoulder, hip, fingers

  • remember “add to your midline”

  • e.g. shoulder, hip, fingers


Movements planes
Movements & Planes

Inversion

  • Turning the sole of the foot inward at the ankle (so the sole of the foot faces toward the midline)

    Eversion

  • turning the sole of the foot outward at the ankle (so the sole of the foot faces away from the midline)

    Elevation

  • raising a part to a superior position

  • e.g. raising your shoulders toward your ears; closing your jaw

    Depression

  • lowering a part to an inferior position

  • e.g. lowering your shoulders to normal or lower than normal position; lowering your jaw to an open position


More…

Protraction

  • Sticking jaw out (pouting)

    Retraction

  • Bringing jaw back to anatomical position

  • Lateral bending

  • bending of the spinal column in the frontal plane to the left or right

  • e.g. bending side to side at the waist


And more
And More…

Movements in the transverse plane around a longitudinal axis

  • (e.g. twist, pirouette)

    Rotation

  • the movement of a bone around its own axis; this is also known as a pivot

  • e.g. the head, neck, and trunk can pivot around the longitudinal axis

    Internal (medial) rotation

  • Rotation towards the midline

  • E.g. turning forearn in towards body

    External (lateral) rotation

  • Rotation away from midline

  • E.g. turning forearm away from body


More…

Pronation

  • rotation of the forearm and hand to the palms down position

    Supination

  • rotation of the forearm and hand to the palms up position (remember holding a cup of “soup”)

    Protraction

  • Shoulder rounding (hunching shoulders)

    Retraction

  • Bringing shoulders back to anatomical position, or squeezing shoulder blades together at back


Special movements
Special movements

Circumduction

  • a combination of abduction, adduction, flexion and extension

  • this action describes a circle

  • e.g. moving the shoulder in a circle (swimming, windmill throw in baseball); can also be done at the hip joint

    Opposition

  • Bringing thumb towards fingers

    Reposition

  • Returning thumb back to anatomical position


Skeletal surface markings
Skeletal Surface Markings

  • The surfaces of bones have various structural features adapted to specific functions. These features are called surface markings. Long bones that bear a great deal of weight have large, rounded ends that can form sturdy joints, for example. Other bones have depressions that receive the rounded ends.


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