Beneath the cloak
chambers wild

We dream of wings...
these things
tentacles that grasp the skies

thoughts
dance with bats
leap beyond the firm-fixed bone

weaving genes...
breach the bounds of night

in halls of thought and dream though
starlit gleam, and molded clay...
of what might be

vision bold
In human form, yet newly played...

engineered designs
rippling fractal vibrations
ever outward...
outward...

out...

each line a flight
unknown night
with the grace
(of a bat in flight)
Dance lightly through that starry space

...focusing on the unique structure and function of the bat's wing muscles, which are crucial for their controlled and agile flight, bats have specialized muscles embedded within their wing membranes called plagiopatagiales proprii. 

These muscles play a pivotal role in adjusting the stiffness of their wings during flight, allowing bats to perform precise maneuvers while navigating through the air. This capability is particularly important as bats need to make quick, efficient movements to capture prey, avoid obstacles, and manage their energy use effectively.

research:
... biomechanics and aerodynamic properties of bat flight

The theoretical idea of humans evolving or growing to develop tentacles or bat wing-like structures from their backs would be a fascinating exploration of speculative biology and bioengineering. Such a concept typically belongs to the realm of science fiction or theoretical evolutionary biology, where hypothetical scenarios are imagined based on scientific principles.

From a biological standpoint, the evolution of completely new anatomical structures like tentacles in humans would be highly improbable under natural conditions due to the slow pace of evolutionary change and the constraints of human genetic heritage. Evolution generally works through gradual modifications of existing structures rather than the sudden appearance of entirely new features.

In the realm of bioengineering, the concept could be explored through the lens of synthetic biology or advanced prosthetics, where biological tissues are engineered to perform specific functions. For instance, integrating flexible, tentacle-like appendages could be envisioned for medical or enhanced mobility applications. Such appendages could potentially be designed to mimic the adaptability and functionality of cephalopod limbs, known for their dexterity and strength.

If these tentacles were to transmogrify into structures similar to bat wings, it suggests a design that allows for both manipulation of objects (as tentacles would) and possibly some form of gliding or flying capability. The integration of bat wing characteristics, such as a flexible skeletal structure and a membranous surface area, could provide insights into developing materials and structures in bioengineering that offer new mobility solutions or assistive technologies.

This kind of theoretical exploration would be interdisciplinary, touching on genetics, robotics, materials science, and evolutionary theory. It also raises significant ethical and practical questions about the extent of human enhancement and the integration of biologically inspired designs in human physiology. Such discussions are important in speculative design and futuristic technology development, often explored in academic discussions, speculative fiction, and theoretical papers in fields like bioethics and biotechnology.