1. Selected Joints & Muscular System I: Architecture
Lecture 9
Selected Joints & Muscular System I: Architecture

2. Shoulder Joint Ligaments of the Shoulder Joint
Fig. 9.15
Ligaments of the Shoulder Joint
Glenohumeral (3)
Transverse humeral
Coracohumeral
Coracoacromial
Coracoclavicular
Muscles of Shoulder Joint
Rotator cuff (4 muscles)

3. Knee Joint Menisci: Fibrocartilage articular disks
Cruciate ligaments: Anterior cruciate ligament and posterior cruciate ligament
Collateral ligaments: Fibular and tibial
Fig. 9.19

4. Knee Injuries and Disorders
Football injuries
Damage to collateral ligaments due to blow
Torn menisci
Torn cruciate ligaments
Figure from Clinical View on page 278

5. Properties of Muscle Contractility Excitability Extensibility
Ability of a muscle to shorten with force
Excitability
Capacity of muscle to respond to a stimulus
Extensibility
Muscle can be stretched to its normal resting length and beyond to a limited degree
Elasticity
Ability of muscle to recoil to original resting length after stretched

6. General Principles of Muscles
Tendons: Attach muscles to bones
Aponeurosis: A very broad tendon
Muscles
Origin or head: Muscle end attached to more stationary of two bones
Insertion: Muscle end attached to bone with greatest movement
Belly: Largest portion of the muscle between origin and insertion
Synergists: Muscles that work together to cause a movement
Prime mover: Plays major role in accomplishing movement
Agonist: Muscle causing an action when contracts
Antagonist: A muscle working in opposition to agonist
Fixators: Stabilize joint/s crossed by the prime mover

7. Muscle Shapes
Table 10.5

8. Muscle Shapes
Table 10.5

9. Nomenclature
Fig

10. Nomenclature
Fig
Example - extensor carpi radialis longus

11. Review Question
The muscle name transversus thoracis is derived from a combination of its
Size and function
Orientation and location
Relative length and location
Shape and orientation
Function and shape

12. Points to Remember
Skeletal muscles have many shapes and in each instance contraction of the muscle tissue causes body movements through their attachments to the skeleton or beneath the skin.
Understanding the meaning of the parts of a muscle name helps one to learn the muscle.

13. Questions?