1 Bio211 Laboratory 7 Skeletal Muscles

2 Introduction to Skeletal Muscles Muscular system –All skeletal muscles that can be controlled voluntarily –Approximately 700 skeletal muscles Shape or appearance give clues to function –Locomotion and posture; work across joints Origin – point of muscle attachment that moves least Insertion – point of muscle attachment that moves most –Support soft tissue; sheets between bony tissue –Guard body entrances/exits; encircle opening

3 How Skeletal Muscles Are Named Characteristics used to name skeletal muscles –Direction Orientation relative to body midline Rectus, transverse, oblique –Size Relative size of muscle Maximus, minimus, longus, brevis, lattissimus, vastus –Shape Relative shape of muscle Deltoid, trapezius, serratus, rhomboid See Table that will be distributed in class (Lecture 17)

4 How Skeletal Muscles Are Named Characteristics used to name skeletal muscles –Action Principle action Flexor, extensor, abductor, adductor, rotator –Number of origins Number of tendons of origin Biceps (2), triceps (3), quadriceps (4) –Location Temporalis, femoris –Origin and insertion (Origin is always first in name) Sternocleidomastoid, stylohyoid

5 Muscles of the Head * * * * * Notice how the origins and insertions work…

6 Muscles of the Upper Body ** * * * *

7 * * *

8 Muscles Acting on Femur, Tibia, and Fibula Figures from: Martini, Anatomy & Physiology, Prentice Hall, 2001 * * * * * * * *

9 Muscles that Move the Foot * *

10 Muscles that Move the Foot * * * * *

11 What you should do in lab today… Hole’s Laboratory Manual –Exercises in your Wood’s Lab manual This will give you an overview of the major skeletal muscles Note that there are more muscles on theses figures than you will be responsible for on the lab exam (see your Laboratory Guide) You should know origins/insertions/actions for the next LECTURE exam (these will not be tested on Lab Exam 3) Use the SOMSO models and large torso models –locate the major muscles listed in your Lab Guide Exercise 7 –Find the muscles on your lab partner Use the Interactive Physiology CD/MA&P Web in the ACE –Complete the “Anatomy Review: Skeletal Muscle Tissue” sheet and hand this in today before you leave

12 Interactive Physiology CDs/Web… You will be using the CD or Mastering A&P Web site to complete your lab hand-in for today: Anatomy Review: Skeletal Muscle Tissue –Your hand-in sheet follows the order of the CD/Web program –Demo of software Use the computers in the Science Exploration Zone of the ACE (5 th floor) –Tell assistant at front you are in Dr. Erianne’s lab

13 For next regular lab… For Brain and Cranial Nerves; Sheep brain –Read Exercises 24 and 25 in Wood’s Lab Manual (Ex 24) Spinal cord anatomy: pp (Ex 25) Human Brain anatomy: pp (Ex 25) Cranial Nerves: pp (Ex 25) Sheep brain: pp