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Anatomy & Physiology: Skeletal System and Joints

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  • What defines a joint in anatomy?

    A point of contact between two bones, bones and teeth, or bones and cartilage.

  • How are joints structurally classified?

    Based on the presence of a synovial cavity and the type of tissue connecting the bones.

  • What is the functional classification of joints?

    Based on the degree of movement: synarthrosis (no movement), amphiarthrosis (slight movement), diarthrosis (free movement).

  • Describe uniaxial joint movement.

    Movement in one plane or around one axis, e.g., the elbow joint.

  • What are fibrous joints and their characteristics?

    Joints that lack a synovial cavity, connected by dense regular connective tissue, allowing no or slight movement.

  • Name the three types of fibrous joints.

    Sutures, gomphoses, and syndesmoses.

  • What characterizes cartilaginous synchondroses joints?

    They lack a synovial cavity, have hyaline cartilage, and allow no or slight movement.

  • Give examples of cartilaginous synchondroses joints.

    Epiphyseal plate and joint between the 1st rib and sternum.

  • What are symphyses joints?

    Cartilaginous joints with fibrocartilage present, allowing slight movement (amphiarthrosis).

  • List examples of symphyses joints.

    Intervertebral joints, intervertebral discs, and pubic symphysis.

  • What defines synovial joints?

    Joints with a synovial cavity, containing synovial fluid, allowing free movement (diarthrosis).

  • Name key structures of synovial joints.

    Articular cartilage, articular capsule, menisci, bursae, and accessory ligaments (extracapsular and intracapsular).

  • What is the function of synovial fluid?

    It lubricates and nourishes the joint, reducing friction.

  • Define gliding movement in synovial joints.

    Sliding motion where bones remain in contact without changing the angle, e.g., intercarpal joints.

  • What is rotation in joint movement?

    Bone revolves around its longitudinal axis, seen in shoulder and hip joints.

  • Describe angular movements at synovial joints.

    Movements that change the angle between bones: flexion, extension, hyperextension, abduction, adduction, circumduction.

  • What is circumduction?

    Movement where the distal end of a body part moves in a circular path, combining flexion, abduction, extension, and adduction.

  • Name special movements unique to certain joints.

    Elevation/depression, protraction/retraction, inversion/eversion, dorsiflexion/plantarflexion, pronation/supination, opposition.

  • List types of synovial joints by shape and movement.

    Planar (nonaxial), hinge (uniaxial), pivot (uniaxial), condylar (biaxial), saddle (biaxial), ball-and-socket (multiaxial).

  • What is the range of motion (ROM)?

    The range through which bones of a joint can be moved, depending on joint type and structure.

  • How many bones are in the human skeleton and its two main divisions?

    206 bones divided into the axial skeleton (80 bones) and appendicular skeleton (126 bones).

  • What bones make up the axial skeleton?

    Skull, vertebral column, and thorax.

  • What bones make up the appendicular skeleton?

    Upper and lower limbs and their girdles (pectoral and pelvic girdles).

  • What are sutures in the skull?

    Immovable joints between cranial bones, e.g., coronal, sagittal, and lambdoid sutures.

  • Name the three parts of the sternum.

    Manubrium, body, and xiphoid process.

  • What are the true, false, and floating ribs?

    True ribs (1-7) attach directly to sternum; false ribs (8-10) attach via cartilage; floating ribs (11-12) have no sternal attachment.

  • What bones form the pectoral girdle?

    Clavicle and scapula.

  • What is the function of the pelvic girdle?

    Provides stable support for lower limbs and bears body weight.

  • What bones fuse to form the os coxa (hip bone)?

    Ilium, pubis, and ischium.

  • What are the main differences between female and male pelves?

    Female pelvis is broader and shallower with a wider pubic angle (>90°), wider sciatic notch, and oval pelvic outline; male pelvis is narrower with a smaller pubic angle (<90°).