Topic 6d Muscular System- Dr. Basu’s Easy Anatomy & Physiology Lecture

Topic 6d Muscular System- Dr. Basu’s Easy Anatomy & Physiology Lecture


Hi everyone, this is the fourth and final
lecture of topic six muscular system in the human anatomy class. In this lecture we are
going to learn about the skeletal muscles of the human body by dividing the muscles
into muscle grouped based on their location. We will use the following four groupings of
skeletal muscles. Head and neck muscles. Muscles of the upper limb and muscles of the lower
limb. We will start with the head and neck muscles. This slide lists only some of the
important muscles from each group. We will go over all the muscles again when we do the
lab. Important facial muscles include, frontalis, orbicularis oculi, orbicularis oris, buccinator,
and zygomaticus. While the important chewing or mastication muscles include the masseter
which closes the jaw, and temporalis which also closes the jaw. Two important neck muscles
are platysma which pulls the corners of the mouth. Sternocleidomastoid which flexes the
neck and also rotates the head. This figure shows the important neck and head muscles.
Moving to the muscles of the trunk, shoulder, and arm. The first group are the anterior
muscles. This group includes the pectoralis major which adducts and flexes the humerus.
The intercostal muscles. The intercostal muscles include two muscles the external intercostals
and the internal intercostals. These muscles are responsible from the raising and depressing
the rib cage in the thorax and help in respiration. This figure shows the location of the pectoralis
major muscle. Posterior muscles include the trapezius, latissimus dorsi, erector spinae,
quadratus lumborum, and the deltoid. This slide shows some of the muscles discussed
in the previous slide. Some muscles of the arm include the biceps brachii, brachialis,
brachioradialis, and triceps brachii. We have learned about this muscles a little bit in
previous slides. Muscles of the abdominal girdle include the rectus abdominis, external
oblique, internal obleque, and the transversus abdominis. This slide shows the abdominal
muscles. Muscles of the upper limb include as we discussed before the biceps brachii,
brachialis, brachioradialis, and triceps brachii. This slide Shows the triceps brachii in the
posterior view. Muscles of the forearm include the flexor carpi, the flexor digitorum, extensor
carpi, and extensor digitorum. Muscles of the lower limb. Muscles which cause movement
at the hip joint include gluteus maximus, gluteus medium, ilipsoas, and adductor mucles.
This slide shows muscles of the lower limb. Muscles that cause movement in the knee joint
include the hamstring group. The hamstring group includes the biceps femoris, semimembranosus,
and semitendinosus. Other muscles causing movement at the knee joint are sartorius,
and the quadriceps group which includes rectus femoris, and vastus muscles. Muscles that
provide movment at the level of ankle and foot are the tibialis. The extensor digitorum
longus, the fibulas and the soleus. This figure shows the muscles that have just been discussed.
This is an anterior view of the human body muculator. This is the posterior view. There
are three areas or muscles where intramuscular injections is given. The first on is the deltoid
muscle of the arm. The second one is gluteus medius, which is the ventrogluteal hip. The
third one is the vastus laterals of the thigh.

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