BIOL 2005 Lecture Notes - Piriformis Muscle, Quadratus Femoris Muscle, Lateral Circumflex Femoral Artery
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Outline of Lecture 01 (01-06 A; Ruff)
Synovial Joints, Hip
0. Overview of joint types
A. Fibrous: low/no mobility; fibrous connective tissue
- sutures – in skull
- syndesmosis – unites bones via sheets of fibrous tissue (eg. Interosseous membrane)
B. Cartilaginous: some mobility; hyaline cartilage, fibrocartilage
- eg: pubic symphysis, intervertebral bodies, manubrium -> 1st rib
C. Synovial: high mobility; several components, below
- eg: most limb joints!
I. Introduction to Synovial Joints
1. Constant Components
-bone: compact and/or trabecular
- Hyaline cartilage: extent determines range of motion; covers all contact
surfaces between bones
-synovial membrane/cavity: between the two bones
•Synovial cavity has no blood supply; nourished by synovial fluid,
-synovial fluid: hyaline cartilage + synovial fluid => very slippery surface
-fibrous capsule: surrounds joint and
2. Optional Components
- fibrocartilage (deepen cavity, promote sliding): located w/in synovial cav.
Labrum: complete rim around joint; deepens concavity
Disk: fibrocartilege ring across joint; strengthens joint
Meniscus: partial disk (moon-shaped
- fat pad: space filler in joint
- Intracapsular tendon: passes thru fibrous capsule but not thru synovial cav.
- bursa(e): double-walled pockets of synovial membrane filled with fluid that
facilitaes movment (independent or continuous with joint)
B. Joint motions
- axis of rotation: point/line which remains stationary during joint movement
-Abduction: moving away from the median plane of the body.
-Adduction: moving toward the median plane of the body.
-Extension: straightening or increasing the angle between body parts.
-Flexion: bending of a part or decreasing the angle between body parts.
-Protonation: medial rotation of the arm such that the palm faces posteriorly.
-Supination: lateral rotation of the arm such that the palm faces anteriorly.
-Rotation: internal or external with relation to a long bone
II. Review of Pelvis
- Innominate (os coxae): three bones ossify separately, fuse in early 20’s