Skeletal and Cardiac Muscle Contraction

Brachial Plexus Lesions

1. Humeral Fracture and Brachial Plexus Lesions:

• Surgical neck -> Axillary nerve
• Medial epycondile -> Ulnar nerve
• Supracondylar -> Median nerve
• Mid-shaft -> Radial nerve.

Muscle Sarcomere Structure

During the contraction what muscle fiber mantains its uncontracted length?

Focus in this MindMap:

• Z line is "The zorro" ACTing with ACTIN (attached to actin). Be careful the lines not contracts.
• I band includes the zorro act (Z + Actin), and its very active (short with contraction).
• Myosin is like a skate board, the center makes H zone (myHosin), a little Hold in the skateboard-remember band H is the Hold or space between Actin filaments, it shorts with contraction until dissapear.
• A band is the length of the skate board or myosin fiber. Myosin fiber is hard like wood, so they don't contract (ANSWER)

Review:

• Z line: non contracts.
• A band: non contracts.
• H band: contracts.
• I band: contracts
• "HI contraction"