Download Lecture 11: Whole Muscle Behavior

Lecture 11: Whole Muscle Behavior
Reading: M/O 10
What is muscle strength?
54. Explain the anatomical basis of muscle strength.
Why do muscles get bigger when you work out?
55. Explain the reasons why muscles increase in size after a period of lifting weights.
Why are muscles weaker when they are over-stretched or over-contracted?
56. Interpret a graph of the length-tension relationship and discuss the anatomical basis for that
relationship.
Why did ladies in the 50’s wear high-heel bedroom slippers?
57. Describe the anatomical changes that take place when a muscle is chronically contracted.
Why are some folks better long distance runners, while others are better sprinters?
58. List the anatomical and metabolic characteristics of fast, slow and intermediate muscle fibers.
How can one muscle lift both heavy and light things?
59. Define the term motor unit.
Why do we play the piano with our hands and not our feet?
60. Define the term motor unit.
Why are your muscles sometimes sore after working out?
61. Describe the anatomical basis of delayed onset muscle soreness.
Bio 6: Human Anatomy
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Fall 2013: Riggs
Lab 11: Superior Limb Musculature
Reading: M/O Ch 12
Muscles that move the pectoral girdle
Origin
Insertion
Major Action
Other comments
Insertion
Major Action
Other comments
Major Action
Other comments
Pectoralis minor
Serratus anterior
Trapezius
Rhomboids
Muscles that move the arm
Origin
Pectoralis major
Latissimus dorsi
Deltoideus
Subscapularis
Supraspinatus
Infraspinatus
Teres major
Teres minor
Muscles that move the forearm: Flexor surface
Origin
Insertion
Biceps brachii- Long head
Biceps brachii- Short head
Brachialis
Brachioradialis
Bio 6: Human Anatomy
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Fall 2013: Riggs
Muscles that move the forearm: Extensor surface
Origin
Insertion
Major Action
Other comments
Triceps brachii
Triceps brachii- long head
Triceps brachii- medial head
Triceps brachii- lateral head
Muscles that move the hands and fingers: Flexor surface
Origin
Insertion
Major Action
Other comments
Pronator teres
Flexor carpi radialis
Flexor carpi ulnaris
Flexors digitorum (known as a
group only)
Muscles that move the hands and fingers: Extensor surface
Origin
Insertion
Major Action
Other comments
Extensor carpi ulnaris
Extensor carpi radialis
Extensors digitorum (known
as a group only)
Intrinsic muscles of the hand
(known as a group only)
Bio 6: Human Anatomy
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Fall 2013: Riggs
External Brain 11: Upper Limb Muscles
54. Explain the anatomical basis of muscle strength.
55. Explain the reasons why muscles increase in size after a period of lifting weights.
56. Interpret a graph of the length-tension relationship and discuss the anatomical basis for that
relationship.
57. Describe the anatomical changes that take place when a muscle is chronically contracted.
58. List the anatomical and metabolic characteristics of fast, slow and intermediate muscle fibers.
59. Define the term motor unit.
60. Define the term motor unit.
61. Describe the anatomical basis of delayed onset muscle soreness.
Your Task
1. Which of these arise from the throacic wall?
2. Which of these arise from the scapula?
3. Which of these belongs to the rotator cuff?
4. Which two of these define the axilla?
5. Which of these makes up the contour of the shoulder?
6. Which of these is responsible for “marine corps posture”?
7. What are the differences between extrinsic and intrinsic muscles of the hand?
8. Which muscles, acting together, produce “ulnar deviation”? “Radial deviation”?
9. Which of these muscles is an important antagonist of a major action of the biceps brachii?
10. How do the actions of the biceps and brachialis differ? Why?
11. Which of these muscles crosses two joints? How does this affect their major actions?
Bio 6: Human Anatomy
65
Fall 2013: Riggs