शरीरावयवाच्च

Operational rule vidhi

The affix यत् comes in the sense of 'what stays there' after a word denoting a part of the body.

Word by word (padaccheda)

Left context शरीर- अवयवात् pañcamī · ekavacanaIndeclinable च avyaya

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

शरीर-अवयवात् च

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The affix यत् comes in the sense of 'what stays there' after a word denoting a part of the body.
This debars अण् ॥ As दन्तेषु भवं = दन्त्यम् 'dental i. e. what stays there, कर्ण्यम्, ओष्ट्यम् ॥ So also पादे भवं = पद्यं 6.3.53, नासिकायां भवं = नस्यम् ॥

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.