A Sneak Peek at Joints and Muscles

Hey guys and gals, I am currently sooo far behind in anatomy I haven’t had a chance to type up any of my notes bar these two random ass things, so here is a little taster of some Anatomy and Physiology. But good news, I met a boy (again, Its a new flavor every week) but my point it, he may not be attractive to anyone else, but he is fun, and actually makes me laugh, which is something I’ve missed. And more to the point, we are both on the same wavelength and he is actually intellectual. SO i am saying my thanks and hoping this friendship goes some where, but the only problem is that I met him through mat, yes dear, nice, shy, sweet, dull and boring mat. And as it turns out they are best friends, I guess this is the one time where loyalty is a pain in the butt. On the plus side we have been on fake dates (gone out for lunch and dinner, movies and the beach as friends but he pays for everything and its fun, kinda wish i didnt tell him that i was not interested in relationships, but what ever will be will be).

Enough rambling: here we go!

 

 

 

Discuss the structural and functional classification of joints.

The classification based on structure is determined by the lack of synovial joint and type of connective tissue.

  • Fibrous (synovial joint absent)
  • Cartilaginous (synovial joint absent)
  • Synovial

While classification of Function is based upon the degree of movement,

  • Synarthrosis : Immovable
  • Amphiarthrosis : Slightly movable
  • Diarthrosis : Freely movable

The range of movements of these synovial joints can perform are affected by a range of things, eg arthritis.

Fibrous Joints or Fibrous connective tissue holds bones closely together, It lacks a synovial Cavity

  • Sutures: unite the bones of the skull, they are synarthrosis
  • Syndesmoses: are bones united by ligaments – anterior tibiofibular joint and interosseous membrane, They are amphiarthrosis
  • Gomphosis: Ligaments hold a cone shaped peg in bony socket, teeth in alveolar process (attaches) tooth to bone), synarthrosis.

Cartilaginous Joints, lack a synovial cavity and holds bones connected by fibrocartilage or hyaline cartilage.

  • Synchondroses: Synarthrosis, connects through hyaline cartilage. The epiphyseal plate or joints between ribs and sternum.
  • Symphyses: Amphiarthrosis, connects though fibrocartilage. The Intervertebral discs and pubic symphysis.

Synovial Joints: Have a synovial cavity. It separates articulating bones and is diarthrosis.

 

Why is a rich blood supply important for muscle contraction?

There are four steps in muscle contraction cycle: it will repeat until all atp is used up and there is a high level of calcium near the filaments

  1. ATP hydrolysis
  2. Myosin attaches to actin – forms a cross bridge
  3. Power stroke
  4. Myosin and actin detach.

For all this to happen a rich blood supply is required, a greater need for oxygen occurs during muscle contraction. Insufficient oxygen in the blood and this would struggle to happen

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