Lab 7
Microscopic Anatomy and Organization of Skeletal Muscle
Exercise 14
Activity 1: Examining Skeletal Muscle Cell Anatomy
Be sure you can identify striations, nuclei, axons and axon terminals,
muscle cells or fibers. (Plate 2 and Figure from Exercise 6).
Activity 2: Examining the Histological Structure of Skeletal Muscle
Activity 3: Studying the Structure of the Neuromuscular Junction (Plate 4)
Identify axon, axon terminal, and skeletal muscle cell
Gross Anatomy of the Muscular System
Exercise 15
Begin Muscle Anatomy – Do this part to prepare for Lab Exam 2 at the end of the
semester. On the anatomical models, begin to locate all of the muscles on the attached list.
It may help to demonstrate the muscle action as you locate each muscle. Figures are
available on my web site and through links to other web sites to help you with this at
home. I will give you keys to the muscles. Please do not use other keys you may find in the
lab. A table has been supplied at the end of this exercise to help you with this assignment.
You may use the models in the lab and in the ARC. This may require some time outside of
lab to complete.
Note: Although I have asked you to list muscle origins and insertions, you are responsible
only for the identification and action of the muscles on the lab exam.
In Lab Activity
1. Each lab bench has been assigned three muscles. Create a model of each muscle using
clay and attach it correctly to the skeleton. Model all three muscles on the same skeleton.
Each member of the group will present one muscle from their list during the last 30
minutes of lab. In your demonstration each member of the group will:
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
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Introduce yourself
Identify a muscle on the skeleton.
Identify the origin and insertion of the muscle.
Demonstrate the action of the muscle.
The model, demonstration and oral presentation is 40% of your lab 7 grade. You
are all responsible for the quality and accuracy of the demonstration. Each person
in the group must speak during the presentation.
Due at the end of lab or at the next class.
Carefully draw and label the three muscles your group demonstrated in class on the
attached figures. 5 points each.
Muscle Assignments for Lab Tables
Table
Number
Muscle 1
Muscle 2
Muscle 3
1
deltoid
masseter
erector spinae
2
latissimus dorsi
zygomaticus
major
rectus femoris
3
tibialis anterior
temporalis
biceps femoris
4
vastus lateralis
biceps brachii
gastrocnemius
5
trapezius
triceps brachii
rectus abdominis
6
pectoralis major
epicranius occipital and
frontal bellies
gluteus maximus
7
platysma
soleus
gracilis
8
sternocleidomastoid semi-tendinosus
sartorius
Name____________________________
Lab Section ________________
Lab 7 – Muscle Anatomy – turn in at the end of lab or at the next class.
1. Draw and label the three muscles demonstrated by your group where appropriate on these
figures. 5 points each
Name
2. Obtain slides of skeletal muscle and a neuromuscular junction (motor end plate), and
review the structures of each. Draw a picture of each slide below and label where
appropriate: striations, branched cells, intercalated disc, nucleus, axon, and axon
terminal (at neuromuscular junction). Use a colored pencil, a ruler for the leader
lines and print the labels. Colored pencils are available in the lab. Use the 40X lens
for the drawings. 2 Figures, 5 points each.
Skeletal Muscle
Neuromuscular Junction
Worksheet
Do at Home. Using the supplied table, fill in the origin, insertion and action of the muscles
of the head and trunk on the list below, using the tables in the text or lab manual. You may
wish to begin this before coming to lab. Use Tables and Figures in Exercise 15 of the lab
manual or Chapter 10 of the text to help you with this exercise. This will not be graded –
it is a worksheet for you to use to learn the muscles for the lab exam.
Ventral Muscles of the Trunk and Neck (Generally)
external oblique
platysma
internal oblique
rectus abdominis
pectoralis major
serratus anterior
pectoralis minor
sternocleidomastoid
Dorsal Muscles of the Trunk and Neck, Generally
deltoid
rhomboid major
erector spinae
rhomboid minor
infraspinatus
subscapularis
latissimus dorsi
supraspinatus
Muscles of the Head and Neck
epicranius (occipital
belly)
epicranius (frontal
belly)
masseter
orbicularis oculi
orbicularis oris
temporalis
Muscles of the Upper Limb (Generally)
biceps brachii
extensor carpi
brachialis
ulnaris
brachioradialis
extensor digitorum
extensor carpi
(forearm)
radialis longus
flexor carpi radialis
Muscles of the Lower Limb (Generally)
adductor longus
gluteus medius
adductor magnus
gracilis
biceps femoris
pectineus
extensor digitorum
rectus femoris
longus
sartorius
gastrocnemius
semimembranosus
gluteus maximus
semitendinosus
transversus
abdominis
teres major
teres minor
trapezius
zygomaticus major
flexor carpi ulnaris
palmaris longus
triceps brachii –
lateral, medial,
and long heads
soleus
tensor fasciae latae
tibialis anterior
vastus lateralis
vastus medialis
Note: The worksheet is provided for you to help you organize the muscles. It
is not going to be graded. You don’t need to turn it in to me.
Muscle Name
Ventral Trunk and
Neck
External oblique
Internal oblique
Pectoralis major
Pectoralis minor
Platysma
Rectus abdominis
Transversus
abdominis
Sternocleidomastoid
Serratus anterior
Brief Origin
Brief
Insertion
Brief Action
Muscle Worksheet. Please use the text or lab manual and brief but correct
descriptions of the origin, insertion and action of each muscle. You are only
responsible for identification and action on the lab exam.
Dorsal Trunk and
Neck
Deltoid
Infraspinatus
Latissimus dorsi
Rhomboideus major
Rhomboideus minor
Subscapularis
Supraspinatus
Teres major
Teres minor
Trapezius
Muscle Worksheet. Please use the text or lab manual and brief but correct
descriptions of the origin, insertion and action of each muscle. You are only
responsible for identification and action on the lab exam.
Muscle Name
Upper Limb
Biceps brachii
Brachialis
Brachioradialis
Extensor carpi
radialis longus
Extensor carpi
ulnaris
Extensor digitorum
Flexor carpi radialis
Flexor carpi ulnaris
Palmaris longus
Triceps brachii
Lateral head
Medial head
Long head
Brief Origin
Brief
Insertion
Brief Action
Muscle Worksheet. Please use the text or lab manual and brief but correct
descriptions of the origin, insertion and action of each muscle. You are only
responsible for identification and action on the lab exam.
Muscle Name
Brief Origin
Brief
Brief Action
Insertion
Lower Limb
Adductor magnus
Biceps femoris
Adductor Longus
Extensor digitorum
longus
Erector spinae
Gastrocnemius
Gluteus maximus
Gracilis
Pectineus
Gluteus medius
Muscle Worksheet. Please use the text or lab manual and brief but correct
descriptions of the origin, insertion and action of each muscle. You are only
responsible for identification and action on the lab exam.
Muscle Name
Rectus femoris
Sartorius
Semimembranosus
Soleus
Tensor fasciae latae
Vastus lateralis
Semitendinosus
Vastus medialis
Brief Origin
Brief
Insertion
Brief Action
Muscle Worksheet. Please use the text or lab manual and brief but correct
descriptions of the origin, insertion and action of each muscle. You are only
responsible for identification and action on the lab exam.
Muscle Name
Head
Epicranius frontal
belly
Epicranius occipital
belly
Masseter
Orbicularis oris
Temporalis
Zygomaticus major
Orbicularis oculi
Brief Origin
Brief
Insertion
Brief Action