Muscular System Objectives: 1.Review anatomical terminology. 2.Review types of joint movements....
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Transcript of Muscular System Objectives: 1.Review anatomical terminology. 2.Review types of joint movements....
Muscular System
Objectives:
1.Review anatomical terminology.
2.Review types of joint movements.
3.Compare and contrast types of muscle.
More review and assignments:
• Figure 17-2 (Lab Manual)
• Venn diagram of the three types of muscle. Add any other general information you know about muscle.
• Homework: – Add Chapter 8 roots, prefixes, and suffixes
to medical terminology sheet (Vocabulary quiz on Wednesday!!!)
– Medical journal article on a disease or disorder of the muscular system due on test day
Muscle Tissues1. Skeletal muscle tissue (“voluntary”)
– Long, threadlike cells– Striations: alternating light and dark cross-
markings– Each cell has many nuclei just beneath the cell
membrane.
Muscle Tissues (cont.)2. Smooth muscle tissue (“involuntary”)
– No striations– Cells are shorter than skeletal muscle, spindle-
shaped, and have one, centrally located nucleus.– Line walls of internal organs
Muscle Tissues (cont.)
3. Cardiac muscle tissue – heart– Striated and joined end-to-end– Each cell has only one nucleus. ???
Skeletal Muscle Actions
• Movement depends on type of joint the muscle is associated with
• Origin & Insertion:– Origin – the end of the muscle that is
fastened to a relatively immovable or fixed part
– Insertion – the end connected to the movable part on the other side of the joint
– When muscles contract, its insertion is pulled toward its origin (EX: biceps brachii)
Interaction of Skeletal Muscles
• Prime mover – the muscle responsible for MOST of the movement (aka, agonist)
• Synergist - ???
• Antagonist - ???
Major Skeletal Muscles• Names may indicate location, size,
shape, action, number of attachments, or direction of muscle fibers:
• Pectoralis major
• Deltoid
• Extensor digitorum
• Biceps brachii
• Sternocleidomastoid
• External oblique
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Muscles of Facial Expression
• “It takes more muscles to frown than it does to smile.”
• More than 600 skeletal muscles in the body – 60 in the face!– 40 used to frown– 20 used to smile
• Smallest muscle is the stapedius, in the middle ear
• Largest - ???
• Longest - ???
Muscles of Facial Expression (p.188) and Mastication (p.190)
***Epicranius has 2 parts: frontalis and occipitalis.