The Knowledge of bodily structure
is invariably essential for its benefit i.e, for keeping the body healthy. A
physician unless & until knows all the intricate secrets of this body, he
cannot comprehend the factors that are beneficial for this body.
Acharya Sushruta pioneer of
Rachana Shareera presented the science of Kala Shareera in the chapter
“Garbhavyakarana nama shareera” under which he tried to emphasize the concept
of kala along with fundamental science.
While composing the Anatomical and Physiological
Sciences Ayurvedic acharya’s thought much for the basic constituents of the
body (Dhatu) and their substratum (Ashaya). While considering upon the ashaya
they had also thought of the linings making internal walls of the ashaya,
designating them as Kala.They presented it in a very silent way.
Definition
of Kala According to different Acharya’s,
According to Sushruta Samhita:
Seven kalas are appearing as structure intervening
between dhatu and their seat ashayas. Among the seven kalas, fourth is Shleshmadhara-kala is very
important amongst all of them which is situated in all the sandhis
(joints).Thus the Shlemadhara-kala present in all sandhis facilitates their
proper functioning
According
to Ashtanga Samgraha and Ashtanga Hrudaya:
Both
Acharyas given similar description
i.e The moisture that remains
inside the spaces in the dhatus (tissues) gets cooked (processed) by the heat
present in them (tissues), forms into
structure similar to those found in the wood (tree) and become covered with
snayu (tendenous sheath), shlesma (kapha) and jarayu (chorionic membrane). It
is called as kala, because it is formed from very little quantity of rasa, and
essence of dhatus (tissues).
According to Bhavaprakasha Samhita:
The
kleda (lubricating material, moist substances) present inside the dhatu
(tissue), ashaya (organ/viscera), and dhatvantara (places in between
organs/tissue) which gets cooked by the dehosma (heat of the body tissues) is
known as kala.
According to Sharangadhara
Samhita:
The moisture present in the dhatus
undergo transformation by the heat of the body and forms into structure known
as kala. (Lining membranes, sheaths coverings and secreting membranes).
Details of kala According to
Sushruta Samhita:
The kalas too number
seven in all and are situated at the extreme borders (forming encasement and
support) of different fundamental princeples (DHATUS) OF The organism.
Memorable verses- as the
duramen or core of a piece of wood or stem become exposed to view by cutting in
to it so the root principles of the body may be removing the successive layers
or tissues of its flesh. These kalas are extensively supplied with snayus (fibrous tissues),bathed
in mucous ,and encased in a membranous covering.
branch out.
The moisture present inside
the dhatu and asayas cooked by their own heat (of each dhatu and asaya) become
transformed in to structures called kala,just as essence gets formed in the
trees .these are covered with sleshman
(kapha),snayu(tendenous waxy material) or apara (chorion); these are seven in
number .
Identification of these
structures known as kala has still remained a problem. These are generally
assumed to be thin membrance , responsible for certain specific functions.
Their names and details as furnished in susruta samhita chapter 4 of
sarirsthana is as follows –
1) Mamsadhara kala- present inside the muscles and allow the formation of net work of veins,
arteries, tendons and other tubular structures.
2) Raktadhara kala – present inside the muscls and more in the liver and spleen and holding the blood inside them
3) Medodhara kala – present in abdomen and interior of the bones holding the bone marrow
(red marrow in small bones and yellow
marrow in big bones)
4) Sleshmadhara kala- present inside the bony joints providing lubrication for easy movement.
5)-Purisadhara kala- present inside the pakvasaya and (intestine) attends to the function of
separation the waste (faecal matter) at the unduka.
6) Pittadhara kala- present inside the amasaya (stomach and duodenum) with holds the ingested
food for sometimes in the amasaya and attends the cooking of food.
7) Sukradhara kala- present in the right side of the urinary bladder spoken in terms of modern
anatomical knowledge, they may be
identified as-
Mamsadhara kala- seath or separating membranes of individual muscles
Raktadhara
kala- heamopoitic membranes of liver and spleen.
Medodhara kala- membrane secreting synovial
fluid
Sleshmadhara kala.-is present about all the joint and it is synovial membrane
purisadhara kala- mucus membrane of the intestine attending
to absorption
Pittadhara kala –mucus membrane of the stomach ,duodenum and small intestine attending to
digestion of food
Sukra dhara kala- membrane inside the testis
and seminal ducts,producing and transporting semen
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Sushruta has mentioned 7 kalas
they are called as boundaries between the Dhatus and Aashaya, named as Dhatvashayantar-Maryada. Kleda
which is present in between the dhatu and aashaya metabolized under the
influence of dehoshma thus it forms the kala.
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Shleshmadhara-kala is very
important amongst all of them which is situated in all the sandhis
(joints).Thus the Shlemadhara-kala present in all sandhis facilitates their
proper functioning.
Shleshmadhara
kala:
The kala (lining) having importance in the present subject is Sleshmadhara. It is stated to be
present in all joints. The shleshma contained
in the sac lubricates the joint and enable them to function
smoothly like a wheel which easily rotates upon a well greased axile.
Shleshaka kapha:
It is one of the components of Kapha dosha which located at Sandhies to help in their function,
these components if the bony joints firmly united, protect their articulatation
and oppose their separation. These functions are helped by the qualities of Kapha Dosha such as Snigdha, Shlakshna, Picchila and Mritsna.
Synovial membrane
synovial membrane of the knee joint lines the
capsule. Except posterior where it is reflected forward by the cruciate
ligaments, forming a common covering for both ligaments.
In front, it is absent from the patella. Above the patella, it is
prolonged upwords for 5 cm .or more as the suprapatellar bursa, belOw the
patella, it covers the deep surface of the infrapatellar pad of fat, which
separates it from the ligament patellae. A median fold, infrapatellar synovial
fold, extends backwards from the pad of fat the intercondylar fossa of
the femur. an alar fold diverges on each side from the median fold to reach the
lateral adages of the patella.
Unfolding
suprapatellar recess.
Anteriorly,
the reflection of the synovial membrane lies on the femur; located at some
distance from the cartilage because of the presence of the suprapatellar bursa.
Above, the reflection appears lifted from the bone by underlying periosteal
connective tissue. In a standing posture, the suprapatellar bursa is seemingly
redundant. It is however also referred to as the suprapatellar synovial recess
as it gradually unfolds as the knee is flexed; to open up completely when the
knee is flexed 130 degrees. The suprapatellar bursa is prevented from being
pinched during extension by the articularis genus muscle. On the tibia, the
anterior reflection and attachment of the synovial membrane is located near the
cartilage.
Anteriorly,
the infrapatellar fat pad is inserted below the patella and between the two
membranes. It extends from the lower margin of the patella above, to the
infrapatellar synovial fold below. With its free upper margin, this fold
extends dorsally through the joint space to surround the two cruciate ligaments
from the front, thus dividing the surrounding joint space into two chambers.
Laterally of this are a pair of alar folds.
Posteriorly,
the femoral attachment of the synovial membrane is located at the cartilaginous
margin of the lateral and medial femoral condyles, why the joint space has two
dorsal extensions. Between these, the synovial membrane passes in front of the
anterior and posterior cruciate ligaments, why these ligaments are both
intracapsular and extra-articular with their tibial attachment located exactly
on the cartilage margin. Both the lateral and medial meniscus is, however,
located within the synovial capsule
It
is a thin, but strong, fibrous membrane which is strengthened in almost its
entire extent by bands inseparably connected with it.
Above
and in front, beneath the tendon of the Quadriceps femoris, it is represented
only by the synovial membrane.
Its
chief strengthening bands are derived from the fascia lata and from the tendons
surrounding the joint
Synovial
fluid:
The synovial membrane secretes synovial fluid (ov = egg)
which forms a thin film over the surfaces within the articular capsule. This
viscous, clear or pale yellow fluid was named for its similarity in appearance
and consistency to uncooked egg-white (albumin). Synovial fluid consists of
hyaluronic acid, secreted by fibroblast-like cells in the synovial membrane and
interstitial fluid filtered from blood plasma. Its several functions include
reducing friction by
lubricating
the joint and supplying nutrients to and removing metabolic wastes from the
chondrocytes within articular cartilage. Synovial fluid also contains
phagocytic cells that remove microbes and the debris that results from the
normal wear and tear in the joint. When a synovial joint is immovable for a
time, the fluid is quite viscous (gel-like) but as the joint movement increases
the fluid becomes less viscous
Bursae
Bursae
of the knee joint
The
numerous bursae surrounding the knee joint can be divided into the
communicating and the non-cummunicating bursae:
Communicating bursae:
The suprapatellar bursa, the largest
bursa, extends the joint space anteriorly and proximally.
The subpopliteal recess and
semimembranosus bursa are located posteriorly and are much smaller
The lateral and medial subtendinous bursae of
gastrocnemius are located at the origin of the two heads of the gastrocnemius
muscle.
Non-communicating bursae:
The subcutaneous prepatellar bursa is located
in front of the patella.
The [deep] infrapatellar bursa is
located under the patella, between the patellar ligament and the fibrous
membrane of the joint capsule. It is communicating with the joint space in
particular cases.
Other less regularly present
bursae include the subfascial prepatellar, the subtendinous prepatellar, and
the subcutaneous prepatellar bursae.
Adding
to the complex structure of the knee space, there are remnants of three
embryonic septal divisions of the knee space called synovial plicae:
The suprapatellar plica dividing the suprapatellar recess
The
infrapatellar plica, in front of the anterior cruciate ligament, reaches from
the intercondylar notch to the infrapateller fat pad
The medial patellar plica, located adjacent to
the patella's medial facet, runs vertically along the medial joint capsule
