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INITIAL LYMPH VESSELS & LYMPH CAPILLARIES - Coggle Diagram
INITIAL LYMPH VESSELS & LYMPH CAPILLARIES
Initial Lymph Capillaries
AKA
Initial Lymph Vessels
Location
just beneath the
epidermis
1mm deep
The
main purpose
of
initial lymph capillaries
is
Lymph formation
Which results in
The
absorption
of
Lymphatic Loads
into the
lymphatic system
There are
1 - 3 projections
on
each lymph capillary
Start as
fingerlike projections
that represent the
beginnings of the Lymphatic System
lymph fluid
absorbed by the
initial lymph vessel
system reaches the
lymph collectors
via
pre-collectors
PRE-COLLECTORS
To
connect
superficial capillaries
with
superficial collectors
Are composed of a single layer of
endothelial cells
Each
lymph capillary endothelial cell
is connected to the surrounding
interstitial tissue
via
ANCHORING FILAMENTS
That may overlap or lay close to each other
These
anchoring filaments
allow the lymph capillaries to stay open even under high pressure in the tissues (ex swellings)
If
interstitial fluid
accumulates, and the tissue pressure increases, the stretched
anchoring filaments
will cause a pull on the
endothelial cells
resulting in
open junctions
between these cells.
Through these openings or
inlet valves
, excess
interstitial fluid
and other LL's will then be able to enter the
initial lymphatic system
Review
High
interstitial pressure opens the
inlet valves
of the
lymphatic capillaries
by means of pulling on the
anchoring filaments**
LL's
are able to enter the
lymphatic capillary
from the interstitial space. A process known as
lymph formation
1 more item...
There are
no connections
between these endothelial cells
Are where
lymph formation
begins
They cover the entire body surface to form the
INITIAL LYMPH VESSEL PLEXUS
Altitude
The average tissue pressure at
sea level
is
3 mm Hg
Atmospheric pressure
increases
at lower altitudes and
decreases
with higher altitudes (the air is thinner)
LYMPHATIC AREA
Each
capillary
is responsible for an area of
3-4cm in circumference
Except on the
flexor aspect of fingers
and
soles of the feet
Where
lymphatic capillaries
cover and area
1.5-2cm
in circumference
Capillaries are more
dense
On
palms of the hands
Have
no valves
They are slightly
larger
than
blood capillaries
PERFORATING PRE-COLLECTORS
Before treatment of the involved limb the trunk must be
prepared
or
cleared
It is a
direct connection
between the
superficial
and
deep
lymphatic system
It's
normally dormant
unless under
high intra-lymphatic pressure